These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Russians are shown once an episode whenever they "showcase" partiers. And Frank Stallone always has an insult for them.
Gamers, Comic Book/Sci-Fi fans, or anyone who enjoys things considered 'nerdy'. They're described as lonely, socially retarded, repulsive to women, and otherwise subhuman.
Any elderly person appearing in a "Drivers" episode will become a magnet for snide remarks about how the elderly shouldn't drive. They also tend to attract unpleasant commentary on any sex-related topic.
Whenever a clip features a red-headed person being beaten, or gets involved in some kind of brawl, expect the obligatory, "Red-headed stepchild" cracks (followed by an insert of Danny Bonaduce, and sometimes Judy Gold, looking unimpressed).
During an episode of "Motorheads," the cast discusses a clip of a pastor crashing his motorcycle during a church service. When the narrator tells us that he's recovered, apparent atheist-slash-agnostic Jaime Andrews asks "He has since recovered from the accident, or from religion...?"
From a "Performers" episode, a man dressed as Elmo to take pictures with kids in Central Park starts hurling out Anti-Semitic epithets at the crowd. When the cops proceed to arrest the man, he explains his rant to them that Jews are always out to keep Christian people from making some decent money; Judy argues that's not true, but admits Mel Gibsonis the exception, while Billy says he used the incident as a lesson to his kids about Jewish control of the media.
Big Lipped Alligator Moment: In "World's Dumbest Partiers 5", we see a clip of Rob D'Alessandro, an incredibly drunk New York Giants fan, who blubbers like a baby over the team losing... so much so, the Smoking Gun brings Rob in for an interview, and he's still very emotional about it... until they bring in the Giants' Osi Umenyiora to cheer him up. Finally, TSG just makes it weird by super-imposing the two of them into a scenery of floating clouds, and playing slow, romantic music in the background.
The 5th Performers episode starts with a clip of an eccentric German DJ. Mike Trainor comments that he's "Available for weddings, birthdays, and bar mi— ... weddings and birthdays!"
One of the sequences features a father throwing his baby (in a car seat) out of the car while it's still moving. The commentators were not amused.
In fact, this is generally the commentators' reaction whenever there are children involved in a crime. Judy Gold especially seems to get ticked off.
A number of viewers felt this way when the show featured a clip of a man, who may or may not have been mentally ill, walking into a convenient store in the middle of the night, stealing bags of chips, while wearing nothing but a diaper.
In-universe, Mike Trainor was met with boos and jeers in an Inventions episode, when he suggests Chelsea Perretti should try out a small contraption that changes the profile shape of a person's nose.
When someone was trying to escape a transvestite prostitute without paying, one commenter said "If you order a taco, even if it's got a hot dog in it, you gotta pay for it."
During a clip of people trying to push open a door that clearly says "Pull" on it, Leif Garrett comments, "People, if the door doesn't push, what does it do?" Everybody chimes in with "PULL!"
Ensemble Darkhorse: Daisy Gardner, even though she's not used often as a commentator, has quite the fanbase.
"Funny Aneurysm" Moment: "World's Smartest Inventions 6" features My Kid's Pack, a bullet proof shield that fits into childrens' backpacks; much of the cast have a field day (no pun intended) making fun of the dangers kids face at school each day, such as rough lunch tables, among other things... however, fast-forward to today, where mass school shootings, such as Sandy Hook, are problems multiple times a year (and the number has, in fact, tripled since this episode aired).
Remember those two teenage girls who robbed that girl scout of the money she earned selling cookies, and then they later returned to the scene of the crime to brag about their petty theft for the local news? Well, one of those girls was actually arrested and charged with even more serious crimes since then, including attempted murder. And even then, she still was totally indifferent about her acts of crime.
Never Live It Down: The controversies surrounding Tonya Harding are constantly brought up by the other cast members. Leif Garrett's past issues with drugs are also frequently made fun of. (Often by Leif himself.)
Leif was featured in one of the clips which shows him getting arrested for hiding crack in his shoes.
Danny Bonaduce and his punching transvestites are brought up from time to time. Mostly whenever a transvestite is in a clip.
His 'adventure' was even the subject of one (animated) clip.
Brad: How much of a badass do you have to be to get a SWAT team called in when you're drunk?
Danny: SWAT stands for "Stupid Wrestler Arrest Team"!
Replacement Scrappies: Pretty much everyone that took over for nearly the entire original cast in Season 16. It also doesn't help that pretty much all of the new cast members (save for Gilbert Gottfried) are comedians that most people have never even heard of before. Not that anyone on this show is a big A-lister or anything, but many of the comedians who were already on this show are at least obscure celebrities as opposed to being unknowns.
Seasonal Rot: Season 16 is starting to look like a completely different show.
Snark Bait: The dumb criminals (and people in general) who are highlighted.
The commentators too, especially Frank Stallone and Tonya Harding.
Squick: So many examples, but a few that come to mind are a guy getting his finger snapped off and another guy having sexwith a back yard table.
World's Dumbest Daredevils 12 has a matadore take a horn through the bottom of his jaw and out his mouth. They show it several times, in slow mo.
In a "World's Dumbest Thrillseekers" episode, a unicyclist tries to balance on top of a rod iron gate... guess what happens from there.
That same episode features a clip of a Revolutionary War reenactment, where a man is struck in the face with a real sword; we see his nose practically just dangling off of his face while blood pours from the wound.
"World's Dumbest Performers 14" features a clip of a girl, whose claim to fame is sewing things (like her name) into her tongue... of course, leave it to Danny Bonaduce to give it a try himself.
"World's Dumbest Dummies" features surveillance footage of a kitchen employee in a taco shack, who stops preparing food to change her dog's diaper... actually picking up the dog, placing him on the preparation table, and setting aside the soiled diaper just inches away from the food she was preparing!
A clip where a DJ is blindfolded, while others in the radio station bring him, presumably to him, a woman with a nice body for him to grope, fondle, and feel up... only to find out the others pranked him, and it's his own mother he felt up!
In "World's Dumbest Thrillseekers 5", Chuck Nice takes joy in announcing the show no longer has to blur out clips of people vomitting, and sure enough, we follow with a clip of some Brazilian friends on a rollercoaster, where one of them does, indeed, throw up on one of her friends. Even Chelsea Peretti announces, "I can't watch people vomitting, so I quit."
In "World's Dumbest Brawlers 3", we're treated to a clip from a B-grade martial arts movie, where one of the brawlers loses both of his eyes - one after being struck against a wall really and his eye somehow sticks to the wall, and other after he gets caught on a giant hook and is lifted into the air.
They Changed It, Now It Sucks: The general reaction from the fandom after a mass exodus of cast members for Season 16, most notably Danny Bonaduce, Tonya Harding, Todd Bridges, Leif Garrett and Frank Stallone.
They Copied It, So It Sucks: At least once a year, truTV practically makes a carbon copy of this show, utilizing the exact same clips seen on this show, and maybe changing up the format slightly (though they're all still countdown shows).
2009 saw It Only Hurts When I Laugh, which was the first Tru TV show to feature laughing audience members in the background. Narrated by Thom Kikot, then Frank Nicotero.
2012 saw Clipaholics, and instead of celebrity commentary, we were treated to witty and sometimes sarcastic narrations provided by Jason Alexander.
2012 also saw Upload with Shaquille O'Neal, where the celebrity commentary and Jason Alexander narrations are replaced with Shaq and his buddies sitting around and watching the clips.
Now, in 2013, we have Top 20 Funniest, where instead of celebrity commentart, Jason Alexander narrating, Shaq and his buddies sitting around, we're treated to a low-key announcer who basically gives a play-by-play of each of the clips... oh yeah, and his comments (and some of the dumb antics in the clips) are accompanied by a Laugh Track.
They Wasted a Perfectly Good Plot: There are quite a few people who would enjoy watching the idiots in the videos if the "celebrities" weren't there making comments. Though then, the show would be too much like Most Daring and Most Shocking.
There are also some who would prefer the clips more if they didn't occasionally dub in childlike voice-acting.
There is also a show called Top 20 Most Shocking now which is basically the original Most Shocking, but with the announcer being snarkier. And a lot more episodes where the theme is something you would expect on Worlds Dumbest.
Worlds Wildest Vacation Videos is very similar to this as well.
What an Idiot: There are too many examples in this series to count, but a particularly good one took place in Boston, Massachusetts. The Giants had just beaten the Patriots in the Super Bowl, and a mob of at least 200 Patriots fans were PISSED OFF. The idiot? A lone Giants fan in the middle of the crowd, taunting all of the Patriots fans who surrounded him. As Michael Loftus put it, he was lucky that he was able to walk after doing something that can only be described as idiotically self-destructive.
One daredevil breaks his wrist while attempting skateboarding stunts. 24 hours later, he's back out on his skateboard, trying another stunt...only to break hisOTHER wrist!!!
Leif Garrett doesn't know that "holler" is a real word; this could be justified, as "holler" is probably more of a regional term.
Jaime Andrews must have never seen any of the Austin Powers movies if she thinks a furniture salesman who dresses like Dr. Evil in his commercial is dressed like a... penis?