A character performs an impressive dive into a lake, swimming pool, or other body of water. The audience is amazed at the diver's prowess... so why are they staring and covering their children's eyes? Hilarity Ensues when the diver notices his or her swimsuit floating leisurely on the pool's surface. According to Rich Hall, this embarrassing phenomenon is known as detruncus and may happen to either a man or a woman. Women are more likely to lose their tops, but not always. A subtrope of Wardrobe Malfunction. Related to Gone Swimming, Clothes Stolen. Invokes Naked People Are Funny when used for comedy.
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- A Hope cigarette commercial features a pool scene, which starts off with one bikini-clad girl diving into the pool. Seconds later, her top is shown floating on the water, and at the end of the commercial, same girl is shown, in the pool, covering her bare chest with her arms, with a dismayed look on her face, and then ducking into the water. Humorously played in the same commercial with a guy, who also dives into the pool, and his Dodgy Toupee comes off.
- There was an old Snickers commercial where this happened to a surfer.
- Happens to Smilin' Bob in one Enzyte commercial. Because of what Enzyte claimed to be ("natural male enhancement"), Bob was only too happy to put on a show.
- The premise of a commercial for some sort of Jewish social network. (mildly NSFW)
- Happens to Homer Simpson in a CC's potato chips commercial.
- Happens to an unfortunate young swimmer in a Hitachi DVD Cam commercial http://www.tvspots.tv/video/24416/hitachi--the-tragedy
- Happens to a young boy in a Camelback Lodge and Indoor Waterpark commercial. His trunks come off and the embarrassed lad has to endure his little sister laughing at him while his surprised mother holds up his wayward trunks.
Anime & Manga
- This happens once to Princess Allura in Voltron (a.k.a. Princess Fala of GoLion). A high dive while wearing a bikini leads to her top surfacing before she did.
- In the Angel Blade: Punish! OAV 2, Ayame, a Highly Visible Hottie Ninja, jumps from a diving board on a 99-meter-tall tower. Naturally, she dives into the pool unharmed... except that she loses her bikini in the water, to the great delight of the men around. And yes, in this case, both pieces of the swimsuit come off — it is a Hentai series.
- Happens in School Rumble. Nara thought that it had happened to Tenma and went to retrieve it for her... but it was actually Harima's.
- In Arad Senki Slapup Party, Ryunmei's top ends up coming off while she's playing a game of volleyball. Humorously, the same thing later happens to Baron and Cabensis when they lose their swim trunks to a sea monster.
- Lupin III:
- Happens to Lupin in The Castle of Cagliostro. He dives underwater after one of the Count's aqua-suited goons. As he swims in pursuit through a tunnel, his boxers start to slip. At the end of the chase, he drags the unfortunate goon back into the tunnel... then reaches out to snatch his boxers before they can float away.
- A chilling example happens in the series, where a woman dives into a pool ahead of Fujiko. Unfortunately for her, an assassin targeting the gang had filled the pool with acid; the floating bikini top serves as a Dead Hat Shot.
- A girl knows she is a Butt Monkey when she has Super Drowning Skills and, during her first day of school, she still ends up thrown into a pool while wearing a one-piece School Swimsuit... which somehow is slippery enough to leave her completely nude. Ryuubi from Ikki Tousen discovers this the hard way.
- Tsuda fantasizes that this might happen to Aria in the Beach Episode of Seitokai Yakuindomo. What actually happens exceeds his expectations.
- SHUFFLE! The first half of episode 9 involves the whole cast enjoying themselves at the beach, including Asa getting her bikini top washed away by a large wave.
- Happens to Gai in Rock Lee's Springtime of Youth. Lee himself thinks it was Sakura, and he shoves the trunks in her face.
- Yuno's bikini top gets washed away at a water park in Mirai Nikki, and she ends up covering her front by clinging to the back of her love interest Yukiteru until the staff can retrieve it for her... but knowing Yuno, she may have done it on purpose as part of her plan to make him fall in love with her.
- If you see Machiko-sensei (from Maicchingu Machiko Sensei) in a bathing suit, it will inevitably slip off.
- In the first Fairy Tail OVA, Makarov loses his speedo, much to the horror of the boys spying on the pool.
- Seen in a strip of Le Petit Spirou. Spirou and his friend Cassius are at the beach, waiting to get into the water by counting the waves. On cue, the 75th is bigger than the others, stripping the girls from their class as well as their Hot Teacher from their swimsuits — at which point the boys jump in with diving mask and snorkel to see underwater.
- The cover◊ for the Spirou compilation #309, with characters from the French-Canadian comic Les Nombrils, features such an incident.
- Invoked in the Beach Issue of Mazing Man. Guido gets a bunch of girls in bikinis to go into the water with him and flap their arms, because at least one of their tops will come off. It happens all right — to the ugly chick. Cue In-Universe Squick.
- In an Archie Comics story, Veronica was upset that Archie was paying more attention to his fishing than her, so she grabbed a spare swim suit, hooked it to Archie's line, and told him he hooked her suit (the one she was wearing). Then she let him reel it in and told him he'd pulled it off of her. The rest of the story involved Archie trying to find something for her to cover up with.
Films — Live-Action
- Home Alone 2: Lost in New York: When Kevin cannonballs into the hotel pool, wearing swimtrunks that were meant for his dad.
- The Little Rascals movie in 1994 had this happen to Alfalfa, but he was swimming in his underwear.
- In some surf movie called The Surfer King, this happens to a girl when two guys tell the guy operating a surf simulating ride to turn it up. It causes her bottoms to come off, but she fails to notice and walks away.
- Buster Keaton loses his oversized rental suit in a public pool in The Cameraman.
- Done in Diary of a Wimpy Kid: Dog Days. Greg loses his swimsuit on the diving board, and in order to spite him, a little girl takes it and places it on a post close to the entrance. Greg is forced to stake out in the pool without anyone seeing him, and eventually manages to get an extra suit... a pair of pink short-shorts.
- Some mischievous boys slip a hook into the back of a rival's speedo in "Swim Team" so that when he jumps into the water his speedo rips off. https://www.youtube.com/watch?v=OqY83PTgAmA
- Mr. Bean, after finally gaining enough courage to perform a high dive at a pool, loses his swimsuit in front of a class of 10- to 12-year-old girls.
- Even Stevens: Louis was trying to show his dad that he could be serious in a swimming contest.
- On Fear Factor, three female contestants lost their bikini bottoms during a water challenge.
- In the Beach Episode of Zoey 101, Dustin loses his trunks. He's so embarrassed that he refuses to leave the water, and by the end of the day he's sick and miserable.
- On Shake It Up we get this exchange:
CeCe: Remember when we were at camp and I wanted to race those canoes?
Rocky: They were very unstable.
CeCe: No, I'm very unstable! I tipped over the canoe, cut my lip, and my top came off!
Rocky: CeCe, you were ten. Nobody even knew you were a girl.
CeCe: I KNEW!
- Subverted in a Beach Episode of Who's the Boss?. Angela is rescued from the surf and wrapped in a towel. When Tony comes to see if she is alright, someone from the crowd hands her her top, and Tony assumes that this trope is in play. Turns out that not only did she remove it herself, but several people from the crowd actually saw her do it, much to her surprise and embarrassment.
- The Worst Year of My Life, Again: Alex loses his broadshorts and the bathers he was wearing under them in the waterslide on the last day of summer. Due to the loop year, this happens twice.
- In Data East's Playboy 35th Anniversary pinball, a woman in the swimming pool covers her breasts with her hands after losing the top of her bikini. Because the Playboy Mansion is no place for indecent exposure...
- Valkyria Chronicles II has a scene where Aliasse drags Juliana into the pool and due to not watching where she's grabbing, accidentally removes her bikini top. Avan and Zeri stare in awe, while Cosette compliments Juliana's "form". Naturally, Juliana is pissed.
- In Persona 4 Golden, during a trip to the beach, this happens to Kanji.
- Played with and averted in As Told by Ginger: A group of high school girls conspire to remove Courtney's bikini top at a pool party and reveal not just her body, but also the fact that she stuffed her top to appear more adult. Averted when the main characters find out and counter-plan to help cover up Courtney and retrieve her bikini top before anyone sees much.
- Dexter's Laboratory: After spending all day trying to avoid being pushed in, Dexter eagerly jumps into the pool. Unfortunately. his swimsuit falls off right before he gets out of the water.
- In The Fairly OddParents! episode "Emotion Commotion", the embarrassment of losing his swimsuit in front of his crush causes Timmy to wish he had no emotions.
- Numbuh One in an episode of Codename: Kids Next Door loses his trunks, resulting in an avalanche of jokes about how big his butt is.
- In the Popeye short Alona of the Sarong Seas, this happens first to Olive, then to Popeye and Bluto.
- Total Drama:
- On the episode "Haute Camp-Ture" of Total Drama Island, Izzy emerges from the pool having found a bikini bottom. Katie then points out that it's her bikini bottom. She quickly dives back under the water, exposing her lower half in the process.
- Owen loses his trunks during the first ever challenge on Total Drama Island, and during the opening animation of Total Drama World Tour.
- Occurs in an episode of Dilbert but not to a member of the main cast. An important business client recalls the story of his biggest shame, jumping into a lake when he was a kid , losing his trunks and being forced to walk out of the lake completely nude while all of his friends and family were watching, earning him the nickname "acorn" which haunts him for the rest of his life. Acorn just coincidentally happens to be the name of the new business idea they created for him, however.
- Happens to Lucius on Jimmy Two-Shoes, because he loaded his swimsuit with stolen pirate gold.
- Mentioned in an episode of Clifford's Puppy Days, where Nina says her swimsuit fell off during a dive because it was too big.
- Rated "A" for Awesome: Happens to Les in one episode where he loses his baggy trunks at the local water park. As he is sneaking around naked trying to get them back, the trunks get jammed in one of the water jets and threaten to cause an explosion. Made even funnier by the fact that this happened after he criticised Lars for wearing a tight thong.
- Stoked: Emma loses both halves of her bikini after a particularly spectacular wipe-out in "All We Are Saying is Give Reef a Chance," leaving her naked as other surfers look on.
- This is the primary reason that female surfers tend to wear tank suits (and male surfers sometimes wish they could).
- Actress Jayne Mansfield orchestrated her discovery this way. She untied her bikini top as she was diving into the pool at the launch party for the Jane Russell film Underwater! She emerged topless and feigning embarassment, upstaging Jane Russell at her own event. As the pool was surrounded by reporters and photographers, she made quite a splash and got a contract with a major studio within a week.
- The "Get Naked Bikini". (Link SFW... barely)
- Katy Perry once went on a water-slide and accidentally mooned everyone at the water park. The paparazzi were on hand, of course.
- This once happened to Kirsten Dunst on a beach.
- On British reality TV show Coach Trip, the contestants were taken to the Olympic pool in Barcelona to learn the basics of high-diving. Proceedings came to an embarrassed halt when a buxom young girl from Sunderland performed an impressive dive - losing her bikini bottoms on contact with the water. This was captured for posterity and screened to the nation at five in the evening, albeit with pixellation.