Buffy the Vampire Slayer has a REALLY odd one that seemed like it should have been foreshadowing but it just never came up again. They're fighting an invisible girl and have seen a duo of MIBs hanging around the school. Just as they beat her, the Men In Black come in, apprehend her, and take her away. At the end of the episode we see her in a Government run school full of invisible students including her being taught to be assassins. One must wonder if they're perhaps also working on psychic assassins.
In Once More With Feeling, Buffy and some vampires burst into song during some slayage. She then enters the magic shop hesitant to bring it up, seemingly preferring it to leave it in Alligator territory. It even goes a step further, leaving the audience with the same WTF face, wondering if anyone is going to acknowledge it. But once she talks about it is it revealed that all the others were thinking the same about their own musical numbers that happened off-screen.
There's also the Cheese Man, who shows up in all the protagonists dreams, and... offers them cheese. Word Of God is that it was meant to be utterly nonsensical.
ER actually has a couple of these moments, most noticeably the man who spontaneously combusted (it's never explained or mentioned again) and the time Carol met a man who may actually have been Santa. For a show with no supernatural elements these are quite unusual occurrences.
At Jim and Pam's wedding in The Office, when the entire cast danced down the aisle to "Forever". They were parodying a famous Youtube video. Michael even says: "I saw this on Youtube!" in case it was too subtle.
Doctor Who: Part 7 of The Daleks' Master Plan has our heroes picked up by police on Christmas, getting split up on a Roaring Twenties movie set, and finally breaking the fourth wall. It should perhaps be noted that there was a good reason for this. The episode was broadcast on Christmas Day and the production team worried people might not bother tuning in to watch. By making the episode irrelevant to the plot of the complete (12-part) serial as a whole, they didn't have to worry about people tuning back in the week after and not having a clue what was going on.
At the end of The Hand of Fear, Sarah Jane's departure is made slightly less sad by the sheer ridiculousness of her outfit, coupled with the items she happens to be carrying. As this blogger. described it, "Sarah then exits TARDIS left, clutching a variety of things that seem to be the physical embodiments of non-sequiturs — an owl doll and a tennis racket being the most obvious — as she walks away whistling."
In the Power Rangers Jungle Fury finale: the furry scene. Granted, in Juken Sentai Gekiranger, the furry suits made sense and actually were an integral plotline in that show at one point, but in the Power Rangers show, they are randomly summoned up during the finale, then suddenly removed within twenty seconds, and nobody mentions the event for the rest of the episode (adding to this is that the characters involved with said furries are reduced to Living Scenery status for the rest of the episode as well, and probably for good measure).
For example, in "Flight of the Conchords", there is a scene in which one of the main characters, Bret, suddenly sings a karaoke song in Korean linking two scenes he does not appear in. The song has lyrics such as "sometimes love is as pure as the milk of a cow that has done nothing wrong." As the song ends, he steps out of the screen and the next scene begins.
The random dance numbers in The Mighty Boosh like 'Mod Wolves'.
Snuffbox is kinda similar to the above, except usually the BLAM is the same song repeated every episode, with minor changes to the lyrics.
The Young Ones had a real-life explanation: the program-makers had classed it as a "Variety" series, so that The BBC's light entertainment TV department would give them a higher budget than a "Comedy" series. But that meant each episode had to contain at least one musical number and, y'know, sketches. This is not to say that the The Young Ones team didn't like being able to book and stage their favourite bands, but that's the reason why they did it, along with all the non-sequitur scenes.
Robin Williams and Billy Crystal's guest appearance at the beginning of the Friends episode "The One With the Ultimate Fighting Champion" has no relevance to the plot and is never mentioned again. It wasn't even in the original script, they coincidentally just happened to be in the same building where Friends was filmed and the writers asked if they wanted to make a guest appearance.
There's also "The One With the Baby on the Bus", where Rachel cancels Phoebe's gig at Central Perk to make way for a better and more famous singer (played by Chrissie Hynde of the Pretenders). This isn't weird by itself, but after said better singer is introduced, she proceeds to grind the entire episode to a screeching halt in order to play an entire song (about four minutes long) as though performing in concert for the studio audience. Even showing a snippet of the singer singing wouldn't have been bad — it's just that she went on... and on... and on... even though it had no bearing on the plot, was never mentioned again, and the song itself had nothing to symbolically or thematically connect itself to the events of the episode.
That's because it was just a snippet on the broadcast version. The DVDs have her singing "Angel In The Morning" as an extended scene within the episode.
On the final episode of series 19 of Have I Got News for You, after given his Odd One Out group, Paul Merton begins to ponder the answer. Suddenly, the camera fade-cuts to some footage of Paul and fellow captain, Ian Hislop, skipping through a field in slow motion to sappy soft music for several seconds. Camera cuts back to Paul, who's got a day dreamy expression on his face. He then shakes his head and apologising, saying he was "miles away". The footage popped up again in the later seasons when Joan Collins hosted in a Dynasty spoof, but aside from that, there was no explanation for it. According to Paul of the Very Best of HIGNFY DVD commentary, he tried for eight years to get that gag onto the show and was rejected two times by two different producers, the third try helped and the gag was put in.
A running joke in the fourth season of Nash Bridges had the SIU move into a former disco which would start playing "Disco Inferno" at random intervals without explanation. It's just as weird as it sounds.
One episode of the game show version of Where In The World Is Carmen Sandiego ended with Rockapella (who did the main theme) suddenly start singing another one of their songs, "Zombie Jamboree." It had absolutely no relevance to the episode, and unless the Zombie Apocalypse version of the game was very well-hidden, no relevance even to any incarnation of the series.
In the middle of a segment regarding binge drinking on the talk show The Morning Show with Mike and Juliet, a picture of a cat in a high chair eating spaghetti randomly appeared for a few seconds, and then disappeared. Nobody acknowledges this or ever talks about it again. This quickly became a meme known as "Spaghetti Cat" and it became a running gag on another show, The Soup. Apparently it was a type of dialog censor, but it was still so outlandish and out-of-nowhere that it should count.
The dialogue they wanted to censor was one of the interviewees saying the word "retarded."
Arguably Chuck's attempted rape of Serena (and to some extent Jenny) in the Gossip Girl pilot. Due to the fact that the pilot was based heavily on the books while the rest of the show, not so much, pilot-Chuck differs from the character we see in the rest of the series. His assault of Serena is not only never mentioned again, but she keeps confiding in him and turning to him with her problems, plus she's highly supportive of his relationship with her best friend. Hardly the kind of relationship you have with someone who tried to rape you.
Chuck does eventually apologize to Jenny about it after some major Character Development, and Rufus finally finds out about it in season four.
The pilot for Star Trek: Deep Space Nine has a bizarre (though entertaining) scene inside the wormhole where Sisko and Dax's runabout lands on a solid surface that seems to be a planet. Only, when they step out, each sees a different planet. Then they briefly see the planet the other was seeing, an Orb appears and envelopes Dax, Sisko is sent to a white void, and the episode gets on with the plot. While everything else that happens in the pilot regarding the wormhole and the Prophets is explained (or at least developed upon) in later episodes, the sequence with the subjective planet is never explained, never mentioned, and nothing comparable ever happens again.
This isn't a BLAM as the entire sequence runs in context - Sisko knows his senses are being deceived throughout the entire sequence and the Prophets only interact with him via individuals from his memories (Locutus/Picard, baseball players, the captain of the Saratoga), playing out the very scenes they appeared in. It establishes very early on that the Prophets (sorry, wormhole aliens) can manipulate matter and energy on a fundamental level.
Not quite as bad, but one 4th season episode featuring Kira and Magnificent Bastard Dukat forced to work together to find a long disappeared prisoner transport ship has a scene with the two of them camping for the night. Dukat sits on a 3 inch spike, impaling his butt and requiring assistance from Kira. The next three minutes are just Kira giggling to herself as Dukat wiggles his butt around in the air trying to apply some medicine. Immediately after this, they start talking about the plot/mission again and Dukat reveals he plans on killing his own half-bajoran daughter if she is still alive...
I'd call that almost more of a Pet the Dog moment, since the point seemed to be "humanizing" Dukat somewhat, that he's just like other people: feels pain, and finds a little humor laughing along with Kira when he realizes the medical implement he's using isn't turned on.
Worf is shown at his security panel on the bridge, making Klingon discomfort-noises. He then later faints (“Klingons don’t faint,” he complains) and Dr. Pulaski (ugh) keeps it under her hat, so he thanks her by showing her the Klingon Tea Ceremony, which is apparently a thing. All of this happens before the second commercial break. It is then NEVER MENTIONED AGAIN. It doesn’t relate to the rest of the episode, it’s not somehow a parallel, it’s just like “oh, here’s some stuff that happened.”
In the first season episode "Where No-one Has Gone Before", the Enterprise finds itself in a region of the universe where thought can shape reality, leading to scenes of random crewmembers engaging in activities like ballet dancing in full costume and playing the violin in an orchestra. Essentially the crew's random thoughts force big lipped alligator moments to happen all over the ship until Picard decides enough's enough and orders a red alert and for the crew to focus on their jobs.
The pre-credit sequence to the second season episode "Where Silence Has Lease" has Picard fretting on the bridge about Riker and Worf. We then see the pair sneaking about in a forest before being attacked by some skeleton guys. They fight and kill them, then Worf tries to attack Riker, Riker tells him not to... and they casually walk off the holodeck as the credits come up. It has absolutely nothing to do with the rest of the episode.
"Sushi Roulette" at the start of Season 15 of The Amazing Race. Nearly every task on the show is something that comes out of nowhere and is never mentioned again (barring a Final Exam Boss challenge at the end), but they usually have some sort of bearing on the plot. This task, however, is a different beast entirely. Set on a Japanese game show, each of the eleven teams was positioned at a roulette wheel divided into eleven pieces, two of which always contained wasabi. When the wasabi landed in front of a team, the chosen person would have to eat it fast enough to receive their next clue. To really cement its BLAM status, there were such additions as falling confetti, a bizarre voice calling out "Eat the wasabi!" for each new round, and surreal animation that included a fire-breathing alligator that appeared whenever the wasabi became overwhelming. And when it was over, it never returned in any flashbacks during the season.
Completely intentional (as it's supposed to be a parody of early 80s music videos) example from Not the Nine O'Clock News; "Nice Video, Shame About The Song".
At the end of the first season of Skins, several characters, including a random bus driver and Tony who is in a coma at the time start singing Cat Steven's "Wild World". Not just singing it, but as a full-blown musical number, with backing music- See here: .
In the first episode of Spaced while Tim and Daisy are looking around the flat, they run into a pair of girlscout Creepy Twins in a closet who freak them out, before being promptly forgotten. Apparently, they were originally going to be recurring characters, until the makers decided that there wasn't much else that could be done with them.
The beginning of the second episode of the third series of Ashes to Ashes involves Gene, Chris and Ray dressed as mechanics singing "Up Town Girl". It's promptly revealed as a dream.
In the episode of Supernatural, 'Hammer of the Gods' the boys are doing their usual thing of looking for weaknesses in their Monster of the Week when after a few secondary characters have a little conversation the screen suddenly freaks out in a Do Not Adjust Your Set moment, the opening to Ghostfacers plays. It goes nowhere and is never mentioned again. Apparently, this was supposed to be a segue into a trailer for Ghostfacers. Why it was preserved in the commercialless web copies is anyone's guess.
At the end of one episode toward the end of Moonlighting, the episode was padded by having Herb Viola (Curtis Armstrong) sing "Wooly Bully".
The Full House special where the family went to Disney World had this short sequence where Joey visits an animation studio and draws a sketch of himself on a pad. The sketch suddenly becomes animated, and starts a conversation with Joey before bouncing around playing basketball. Afterwards, Joeys leaves the studio to resume the special's actual plot. Soooo... money well spent on paying the Disney animators, guys?
Toku series will occasionally do blatant promotion of an upcoming show within The Movie of the previous show; this happened for both Kamen Rider Decade and Samurai Sentai Shinkenger, where the action was interrupted so Double and the Goseigers, respectively, could show how awesome they were to get audiences worked up for their own series - all while interrupting the movie's actual plot and contributing little to nothing before running off.
These are usually mildly averted by the upcoming hero defeating a main villain that broke away from the others. For example, when the Go Busters protected the Gokai Galleon from Basco
The Gokaigers' appearance in the Shinkenger/Goseiger crossover turned out to be part of the Time Ranger episode in Gokaiger's own show.
On The Secret Life of the American Teenager, there is scene where Adrian is studying while listening the radio. Then she changes the station and "Istanbul (Not Constantinople)" starts playing. This prompts Adrian to get up and dance like a spaz for about 10 seconds before sitting back down and changing the station. No explanation is given.
Adrian wears Ricky's shirt to school one day after he's caught on video without it (Makes Sense In Context). She then sees him flirting with Grace so she comes up to them and says something like "This is his shirt! And this is where he left it!". She then proceeds to rip off the shirt, chuck it at Grace, and then walks down the hallway in nothing but her bra.
In "Dancing With The Stars", Amy calls Lauren and tells her that she's sending Lauren's old flame over to see her. Lauren reacts by starting to sing, complete with background music. The guy (Jesse) is completely unfazed by a singing Lauren answering the door.
Sonny With A Chance has, in season 2, been including musical numbers. On a show that's supposedly about a group of sketch comedy actors. Okay, 3 of the 5 cast members (4 from 6 if you include Marshall, who can do vaudeville) can sing, and sing well, but that's no excuse.
Something of a case of Fridge Brilliance and Truth in Television. Both Nick and Disney have as almost a requirement, that their teen/tweener star (especially the girls), have to be able to sing and dance, so they can push the tie-in Idol Singer CD's and tours.
The mute little girl sub-plot from the iSpace Out episode of iCarly.
Also, Spencer rubbing butter on his face in iPity the Nevel.
That happens because he's bored, in the end, he gets so bored he just randomly walks into the iCarly studio, during one of their webcasts, drinking what's obviously a beer and acting drunk.
Even though the show is about a bunch of singers, Glee has these all the time, with a sudden transition from say, Rachel and Quinn talking in a hallway at school, Quinn turning around and starting to sing, followed by a transition to the football field where her and the cheerleaders start a dance routing during the song.
Puck randomly stopping the plot and conflict during "Grilled Chesus" to sing Billy Joel's "Only the Good Die Young". The song itself is pretty related to the theme of religion present throughout the episode, but the way it's presented is so random.
With the crazy and often nonsensical sketches in Monty Python's Flying Circus, it'd be difficult for anything to stand out as a Big Lipped Alligator Moment, but the end of Cycling Tour definitely qualifies. The episode is about Mr. Pither and his crazy adventures during a bicycle trip; at the end, when he and his companion part ways, two monsters jump out of the bushes and start dancing.
In the middle of the "Restaurant Abuse/Cannibalism" sketch, which was one of the odder ones*
and that, of course, is saying something
to begin with, a man in Ancient Groman dress enters, delivers a brief pseudo-Shakespearean speech that has nothing to do with the scene, is told off by the waiter, goes away and is not mentioned again.
The X-Files: It's even possible to watch entire episodes and not be fully sure what the point of some - or all - scenes were.
"Improbable" features an episode with Burt Reynolds as a bizarre man who may be God, the devil, or both. Just about every scene with him qualifies, none more so than the very ending in which two characters who occasionally showed up in the background start lip-synching to an Italian folk song, during which the camera pulls away to reveal the area's topography looks just like Reynolds' face.
"The Post-Modern Prometheus": Mulder, Scully, and Monster of the Week go to a Cher concert at the end. It was an important plot point though that the Monster loved Cher which made him un-monsterlike, plus in a perfectly post-modern manner, characters ask authors to change the story and write a better ending. Hence he is not arrested and prosecuted, but they go happily to the concert together.
"Jose Chung's From Outer Space": Men In Black supposedly keep showing up randomly, and they look like celebrities. It's explained in-universe that it's supposed to make people who believe in alien abductions and conspiracy theories look confused and stupid.
"Bad Blood" has Mulder singing the theme song to Shaft for absolutely no reason other than that he was drugged. The story was told in Rashomon Style so we may choose to believe that he in fact did not sing it.
An episode of The Colbert Report had Stephen lead into a long joke about sheep doing crystal meth getting their own show called Breaking Baaaaaa and then celebrated having executed the Best Pun Ever (BPE) with a balloon drop, music, being carried by men like an Egyptian king, fighting a minotaur to the death with a dagger, and then lying down in the company of several women who feed him grapes.
On The L Word, Jenny is looking for directors for the movie of her book, Lez Girls. After a series of relatively normal interviews, she shows up at a small theater where a French man describes his vision of her book as a musical, and opens the curtains to reveal his demo. As if this wasn't strange enough (the song being quite slow and trippy, very unlike your typical movie musical), at the end Jenny recognizes one of the performers as her ex-girlfriend, Marina. Episode ends, incident is never mentioned again.
This happened a few times in Are You Being Served?, but it's most notable in the 1978 special. The store is celebrating Mr. Grace's birthday; the staff have rehearsed an extended musical number to perform as entertainment. At the last minute, they have to perform something else, so they break into an impromptu version of "Steppin' Out". Okay. Suddenly, Mr. Grace appears, holding a puppet body under his neck, singing a song about "bread and drippin'" which contains only a couple of intelligible words in it. This weird little ditty doesn't fit with the other music at all, and turns Mr. Grace from guest of honor to entertainment with no explanation. Then, the staff segue into "Happy Birthday to You" as if nothing had happened.
Farscape, in one episode John orders Pilot to eject a fanatical woman who nearly caused the deaths of hundreds, out into space. When he does so, he laughs in a deep, maniacal, and almost demonic way. He does not laugh like this again throughout the series.
CSI NY featured an episode where a murder is witnessed on a ChatRoulette-style website. This leads to the detectives playing around on the site and Jo gets connected to a Marine in Afghanistan. She picks up her laptop and gives him a view of the New York skyline because he's never been to New York.
Big Time Rush enjoys this trope from time to time, usually with random cutaway gags. Sometimes it subverts this by mentioning an event that happened in their past but has no connection to the plot save being much like what the episode covers (an example being in "Big Time Jobs" when the boys think back to times when they've destroyed things at the Palm Woods). Others it is played straight, like in "Big Time School of Rocque" when they are looking back to when they were wasting the brochures that Kelly gave them (including playing hockey with them, making cutouts of them and even taking a crap with them).
Red Dwarf. Tongue Tied from episode "Parallel Universe". It's a music video is the cold opening to one of the episodes. No context or anything, just that. It's revealed afterwards that it's a recording of one of the Cat's dreams. (One should note that the description of the video isn't even accurate, the scene has nothing to do with "parallel worlds". Apparently even the BBC don't know what was going on with this.)
In series 3 of Waterloo RoadMr. Budgen, a champion dancer is his youth (which was a long time ago) is giving a class a ballroom dancing lesson. Bolton, not impressed, takes exception to his dismissive remarks about breakdancing and proceeds to give him a demonstration. Mr Budgen, not to be outdone, proceeds to demonstrate an earlier, related style which he evidently remembers from his youth and which seems completely and utterly out of character for him.
In Eureka, Henry tries to do something romantic for his wife and ends up asking Fargo for advice. The result is a Crowd Song. Technically not an example, since the entire episode was leading up to it, but gets a free pass since the entire point was for it to be something Henry would never do.
Lampshaded on an episode of Merlin which involves a goblin breaking loose of its prison and causing havoc among the citizens of Camelot. Having thoroughly embarrassed everyone, two of the characters meet in a hallway and agree never to discuss it again. And they haven't.
In the episode "The Changeling", Princess Elena is fed a live frog by her nursemaid. Presumably, this was because she was possessed by a fairy at birth, but it's still a pointless scene, with no lead-up, and is never mentioned again.
VR Troopers features Jeb (the talking lab assistant dog) doing the Doggy Rap in Kaitlin's Front Page, an episode where a trap is set and the male troopers have to rescue Kaitlin. It is also done by the Troopers in My Dog's Girlfriend, so it's a slight subversion, but outside of those two moments, it is never done or mentioned again. However, it's such a hillarious and lighthearted break from the serious story, that ironically, it's not only the first thing people think of (or may be everything they remember from it) that remember that episode, but it's one of the more memorable moments from VR Troopers itself, despite the fact that it had nothing to do with anything going on at the time.
In what was perhaps one of the worst edited seasons of Survivor ever, Redemption Island, this happened to Kristina Kell. She manages to set a Survivor record by finding a hidden immunity idol before day three, before any clues were even handed out. This incident is never mentioned again - even during the season recap, this is conveniently forgotten. Poor Kristina didn't even get to talk to Probst - and he had praised contestants for doing the same in seasons past.
In the Psych episode "Let's Get Hairy", Shawn activates a revolving bookcase which traps Gus on the other side. He then activates it again, bringing Gus back to the room everyone is in. Shawn doesn't notice, and it's never mentioned again.
In the 9th season premiere of Two and a Half Men, Evelyn Harper is showing Charlie's house to prospective buyers, when suddenly Dharma and Greg show up. They bicker for a second. Make sarcastic, and substantially darker comments than they did on their original show, including about divorce and suicide. They decide against buying the house and leave. To say that this is out of left field (especially since Dharma and Greg was cancelled 9 years before, aired on another network, and actress Jenna Elfman already played a different role in an earlier season of Two and a Half Men), is an understatement.
In any episode of Battlestar Galactica (Reimagined) that doesn't involve Gaius Baltar, there'll still be a random scene of him in bed with a beautiful woman that serves no purpose other than to remind us that he's still in the story.
An episode of Season Two of The Good Wife has one at a gala dinner for the Cook County Bar Association where an amateur theater group puts on a strange, poorly-acted play for the lawyers, telling the story of a farm boy who doesn't want his best friend, a cow named Moo Cow, to be drafted to fight in World War II. It is never mentioned again, for obvious reasons.
Louie has had a couple of these. In the first episode Louie is going on a date, and as he's standing outside his date's apartment, they yell to each other through the door as she gets ready. As he's waiting for her, an old woman peeks her head out of the apartment next door and tells him to keep it down because she's naked. She stares at him for a while before opening the door to show him her naked body and calls him a pig several times in different voices. Louie panics, knocks on his date's door again, and the old woman retreats back into her apartment. Louie simply says, "Uh, it just got weird out here."
At the end of that same episode, when the date finally falls apart, the girl jumps up from the bench they're sitting on and runs across the pavement and jumps into a waiting helicopter. There's no explanation for it at all.
A lot of the witchcraft... things... in Smallville season four.
On an episode of Jeopardy!, a clue had a pre-recorded visual clue featuring an inflatable shark. Said shark then made an out-of-nowhere appearance going into commercial and was never referenced again.
On The West Wing, there is an episode where C.J. lip-syncs to "The Jackal", a song no one has ever heard of outside of The West Wing. It's a bizarre scene, having nothing to do with the rest of the episode (or C.J.'s character, for that matter), and is just silly.
Actually, it was a very relevant scene, simultaneously providing some slow-paced quiet nighttime moments before the hectic remainder of the episode set during the following day, giving an excuse for several characters to exchange plot-relevant information while watching the performance (neatly avoiding overuse of the Walk and Talk), establishing CJ's popularity with the rest of the staff and her goofy, extroverted personality, and illustrating the staff's camaraderie and sense of community, as CJ's performances have been a group tradition since the campaign.
Near the end of the George Lopez episode "George of the Rings", George tries to make up for losing Angie's special ring by renewing their wedding vows. Because this is an in-universe Out-of-Character Moment for him, time literally slows down when he says "renew out vows". Then, a ghostly image of George (representing his common sense) tries to talk him out of it, but when George doesn't listen, the Ghost!George kills himself by snapping his neck.
"When We Feast At The Midnight Hour" - a completely random moment comes when the girls are eating lunch and suddenly start pretending Mildred is a surgeon operating on her food, complete with ER type music playing over it too.
"Monkey Business" opens for absolutely no reason with a daydream from Mildred where the teachers fail her for everything and the entire school starts chanting "worst witch!" at her.
If documentaries count, the Megastructures episode about the Millau Bridge is mostly about the technical and economic challenges faced by the construction team, except for one segment about a base jumper who sneaks into the construction site and parachutes off the bridge, not to be mentioned for the rest of the show. It's cool, yes, but not really related to the show's theme of the bridge as a feat of engineering at all.
The Netflix Example Show is completely comprised of such moments, but one that stands out is when a man starts reciting lines from Julius Caesar and then makes popping sounds with his lips and clacks his teeth (The audio for most of the video is the sound of a fountain, except for this scene and a scene of the same man dribbling a ball). Other scenes include the man juggling, shots of a fountain, a time-lapse video of the full moon, and a toy train carrying two toy penguins. Of course, the video was probably never meant to be seen by normal viewers, and was even more probably meant to test codecs. Still, why make a video so random?