That being a small room with hard walls, its acoustics should be bad enough to resign all worries about voice and quality. Add to it that during the bath time one is alone (usually) and feels secure (usually), and it makes more or less a light-hearted version of What You Are in the Dark. Though usually someone overhears the singing character anyway. As a narrative device, this usually is an opportunity to show that the character is in good mood and to demonstrate amusing quirks (beyond this habit as such).
- Aqualad is shown to sing in the shower in Teen Titans: Year One.
Roger: You mean "Earache Hotel".
- One strip had Roger singing "Burning Love" in the shower, and an annoyed Andy meaningfully tells one of the kids about the valve marked "cold water shutoff".
- Roger also did so a second time, this time with "Love Machine." Jason ended up exacting revenge by using the message recorder from the phone to record as the answering machine message taker Roger singing the song while singing in the shower, which went unnoticed by Roger for at least a few weeks. It should also be noted that it was also partly Roger's fault that Jason was able to pull it off, since apparently Roger was the one who bought the model whose cord was long enough to reach the shower.
- Another strip has Peter singing "Heartbreak Hotel", with the rest of the family gathering outside the door to complain:
Andy: I'd say "Headache Hotel".
Paige: "Shampoo-Bottle-Stuffed-Down-His-Stupid-Throat Hotel!"
Jason: Too many syllables, Paige.
- Wanda also had this problem in Baby Blues. One strip had Darryl, Zoe, and Hammie wondering what some noise was, and trace it to the bathroom before discovering that the noise was actually Wanda singing in the shower, when Darryl removed the shower curtain, while also feeling insulted at the implication that she was a bad singer.
- The one-shot fic A Changeling at the Breakfast Table reveals that Queen Chrysalis, who's been hiding out in Twilight's castle for some time, unwittingly revealed her presence with several things. While she's not seen doing it, one of those was because she likes to sing in the shower and Twilight heard her doing it.
- There's an old Norman Wisdom film in which somebody hides a microphone in our hero's bathroom, records him singing in the bath, and pretends it's his own work.
- Summer Stock begins with Judy Garland singing "If You Feel Like Singing" in the shower.
- In one of The Naked Gun movies, Jane is in the shower singing when an assassin walks in to try to kill her. He is entranced by her singing and starts to hum along, then gets louder and louder until he starts belting, which causes Jane to find out he's there and run away.
- Pitch Perfect contains a scene where the protagonist Beca's singing talent is discovered in this way. Beca is forced to sing a duet with Chloe while they're both in the shower and naked. Beca is embarrassed but Chloe doesn't see anything wrong with this.
- In To Rome with Love, Woody Allen's character discovers his daughter's future father-in-law has an amazing voice because of this. He gets him to audition, which fails horribly, because it turns out he can only sing in the shower. Eventually, they stage an opera in which everyone is in appropriate period dress, except him, who sings from a movable shower cubicle.
- In the beginning of Ferris Bueller's Day Off, Ferris starts singing "Danke Schoen" in the shower, using the showerhead as a mike. This of course foreshadows his performance when he hijacks a float in a parade later on that day.
- In Elf, Jovie sings "Baby, It's Cold Outside" in the shower. Buddy listens and tries to join in, freaking her out.
- In Easy A, Olive slowly becomes addicted to the song "Pocketful of Sunshine" by Natasha Bedingfield over her weekend, and is shown singing it in the shower as she grows to like it more and more.
- Michael in Anomalisa hums the Flower Duet from the opera "Lakmé" under the shower.
- Parodied in Alvin and the Chipmunks when Dave catches Alvin taking a shower in the dishwasher while singing "Don't Cha".
- Phantom of the Paradise has Beef singing in the shower. When the Phantom hears him, he threatens him.
- Uncle Frank does this in the Home Alone sequel. Kevin records it on his Talkboy, which comes in handy later on...
- In Harry Potter and the Goblet of Fire, when Harry opens up his egg to reveal the clue for the second task of the Triwizard Tournament, there's a screechy wailing and George Weasley says that it sounds like Percy Weasley singing, saying that maybe Harry has to attack him while he's in the shower. This would imply that this is something that Percy does, but isn't very good at it.
- The Ciaphas Cain short story "The Little Things" has Cain enter the hotel room of his Inquisitorial contact and occasional lover Amberley Vail, and hear her singing in the shower. This causes him to hearken back to his first meeting with her, when she was in an undercover role as essentially a nightclub performer.
- Blackadder: During the fourth series Captain Blackadder is trying to work out where he's going to find a new headliner for the cabaret show he's producing when he overhears Bob singing in the shower.
- Decoy: When asked if she sings, Casey answers, "Sure, but only in the bathtub."
- Doctor Who:
- The Third Doctor sings in the hospital shower in his first appearance in "Spearhead from Space". The Third Doctor would often break out into snatches of song, so it could be assumed this was a regular thing for him.
- The Eleventh Doctor is heard singing in the shower in "The Lodger", while he's sharing a flat and trying to act like an ordinary human being.
- Doogie Howser, M.D.: Doogie has been seen on a couple of occasions belting out a few random The Rolling Stones and Righteous Brothers tunes in the shower (granted he can sing); usually ends with Vinnie subsequently barging in on him.
- The Electric Company (1971): Dracula (or Vincent the Vegetable Vampire?), played by Morgan Freeman, sings about how he loves to take a bath in a casket. No kidding.
- This is how Mr. Schuester learns of Finn's singing talent.
- This scene is mirrored in season 2 with Finn hearing Sam in the locker room shower.
- The Golden Girls: In the season 4 episode "Scared Straight", Blanche's brother Clayton comes to visit and admits to Rose that he's gay. Rose later confesses the truth to Dorothy, and Sophia figures it out on her own. Her reasoning: "I heard him singing in the shower. He's the only man I ever knew who knows all the words to 'Send In the Clowns'."
- The Love Boat: Gopher is overheard singing in the shower and is really good, so he's talked into singing at the crew/guest Talent Contest. But it turns out he's good at singing only while in the shower; so they make a prop shower for him to sing in for the show.
- Orange Is the New Black: Taystee sings in the shower in S 1 Ep 1, and Vee sings in the shower in Season 2. Red overhears the latter—this is how she discovers her nemesis is back.
- In the pilot episode of Star Trek: Voyager, Neelix sings while taking his first bath in a looooong while, much to the displeasure of Tuvok's Vulcan ears. Years later, after unsuccessfully trying to teach him to hold a key, Seven of Nine advises him to confine his singing to his bathroom.
- Tokusou Sentai Dekaranger: Umekos favorite pastime, taking a bath, is often accompanied by singing.
- There's the song "Singing in the Bathtub" (see on Youtube), which is about this, except in the bathtub instead of a shower.
- And there's a song called "Singing in the Shower" which is about... well, guess.
- Imagine Dragons' video for "Roots" features Deliberately Monochrome scenes of Dan Reynolds singing while submerged in a bathtub.
- Sesame Street:
- Ernie sings "Rubber Duckie" (naturally enough) in the bath.
- Olivia, Ernie, Oscar, and Big Bird do so in the song, Sing in the Shower.
- At one point in Max Payne 2, Max comes upon Mona singing Recurring Riff/Solemn Ending Theme "Late Goodbye" in the shower.
Mona Sax: I'll tell you one thing, Mona, you're no singer.
- In Mario & Luigi: Superstar Saga, Mario can be heard humming and vocalising his own theme music in the shower.
- In the online mode of Grand Theft Auto V, when your character is in the shower, you can use your microphone to sing to earn a few Experience Points. With the added bonus of having the entire lobby hearing your awful singing and vote kicking you.
- In The Sims 3 and 4, your Sims will sometimes sing while they're in the shower. In 4's City Living expansion, one can even improve their Singing skill this way.
- During the cutscene before fighting King Jellyfish in Spongebob Squarepants Battle For Bikini Bottom, you can see him doing this. Spongebob compliments his singing ability.
- El Goonish Shive: Tedd sings well in the shower. Which would be irrelevant in context of transgender party karaoke — if it wasn't about Tedd.
- Freefall: It's rubber duck Mozart shower time!
- Amazing Super Powers has a botched analogy case (see also Alt Text).
- Suicide for Hire: Arcturus sings "I'm So Cute" from Frank Zappa.
- Com'c: Victor is heavily implied to do this by the punchline of str'p #36. It doesn't help that he's an atrocious singer.
- Ed, Edd n Eddy: Eddy does this in the beginning of "Over Your Ed", and accidentally swallows the soap.
- Stickin' Around: The beginning of "The Scarlet Pimple" shows Stacy Stickler doing this.
- In the Hey Arnold! episode "Mr. Hyunh Goes Country", Arnold and Gerald hear Mr. Hyunh singing surprisingly well in the shower, and convince him to record a demo and become a star.
- An entire episode of The Flintstones is based on the discovery that Barney could sing really well — but only while bathing. Cue a Zany Scheme to have him perform onstage in a bathtub.
- Similarly, an episode of The Pebbles and Bamm-Bamm Show had Bamm-Bamm being a good singer while only in the shower.
- Wakfu: In season 1 episode 22, a mirage of Evangelyne under the shower is heard humming the show's tune.
- An episode of Recess had the teacher's discover Mikey's great singing voice (by Robert Goulet) that he only sings in while he's in the bathroom, so they train him to sing like that everywhere else (starting with dismantling the bathroom while he sings).
- In the Looney Tunes series, you can always expect the characters to be singing while bathing, usually either "Singing in the Bathtub" or "April Showers."
- In the 3-2-1 Penguins! episode "I Scream, You Scream", Zidgel sings a little song in the ship's shower about how it's great being a man, er, penguin.
- Ready Jet Go!: We don't get to see it on screen, but in "Holidays in Boxwood Terrace", Sean reveals that he sings a lot in the shower.