And then Frank lost it, too, joining the chunk-blowing chorus, the barf brigade, five men in a tossing boat who might have reasons to kill each other, but who, for the moment, could think about nothing except when the next retch would come, and what it would bring up.
In The Hairy Bird, after the boys get drunk, they are given ipecac to sober up for their performance. As they settle into the stands, it starts with just one boy getting sick, and the rest follow. The girls run from the stage.
The story of Lardass in Stand by Me has him trigger this on purpose for revenge.
In Porky's 2 one of the girls simulates vomiting into a decorative pool in a very fancy restaurant preceded by much loud heaving. That leads all the others in the restaurant to start vomiting too. Even more when several people are pushed/fall into that pool.
Occurs in Guest House Paradiso when the owners of the guest house unknowingly feed their guests contaminated fish. Once one guest starts projectile vomiting into the hall, all the other guests start too, causing an enormous flood of vivid green puke.
In The Body, by Stephen King (which became Stand by Me), a story-within-the-story involves a pie-eating contest, in which one contestant deliberately induced vomiting in himself, and set off a chain reaction among other contestants, officials, and the audience.
Causing one of these is how Buster Casey, aka Rant got his nickname. As a kid he created a haunted house with actual brains, blood and guts from a slaughterhouse. Once the other children realized what they were touching...well, apparently the onomatopoeia for hurling is "Raaannntt!"
Happens in Paul Murray's Skippy Dies, after someone spikes the punch bowl at a school dance.
The doomed dinner party in Incompetence features a chain-reaction barf-fest.
In Madness in Maggody, someone tampers with the deli hot sauce at the grand opening of Jim Bob's new supermarket. While the first round of puking is set off by ipecac in the tamales, one of the investigating deputies mentions how at least some of the samples taken from the scene weren't of interest to the lab, having been deposited due to this trope instead.
One memorable Saturday Night Live skit (from season 20) pushed this gag to the breaking point, having every single character spray puke as the vomit chain reaction spread across the entire country after a cop pukes at the sight of a dead body.
A pregnant Pam of The Office (US) deliberately sets this off in response to her co-workers ignoring her requests for a little consideration for her morning sickness.
One episode of Dirty Jobs has Mike at the Jelly Belly Jelly Bean factory and one of the staff admits to having vomited while they were making the vomit-flavored jelly beans (most likely from the smell).
Happens in the Rizzoli & Isles episode "Dirty Little Secret", where Tommy's vomiting (after a floater is pulled out of the river) sets off Frost.
In Trey Parker and Matt Stone's short lived sitcom That's My Bush!, this occurs when one character attempts to get another to vomit by sticking his fingers into his throat and vomiting himself, which inspires others to vomit in turn, leaving everyone in the room vomiting except the person who originally had to.
This is one of the biggest obstacles to success in the game Theme Park. One customer hurls, then another sees it and does the same, and pretty soon your entire park is paved in vomit. The same happens in Theme Hospital.
There is a memorable quest line in the Burning Crusade expansion of World of Warcraft in which the player is asked to deliver a rotten undead egg to a character named Tobias the Filth Gorger. Upon consuming this vile object, his ensuing belch causes this in every NPC (and player) in about fifty yards.
This is very common in Dwarf Fortress, since vomit inspires other dwarves to vomit as well. Because of this and cave adaptation, the front door of your fortress often gets a shallow moat of dwarf puke.
The Comedy Machinima film "Male Restroom Etiquette" has a scene where a guy misses and soils the floor, "so his friends 'Ralph' and 'Chuck' begin to... ralph and chuck."
In the Metalocalypse episode "Mordland", this happens and is due to all of the band members being drunk most of the time. Nathan vomits up blood and goes in for another routine liver transplant.
Although they had all taken ipecac for a vomit holding contest, this appears in Family Guy.
Several other gags involve such a chain reaction spewing; one even dragged it out to an Overly-Long Gag.
In "Yug Ylimaf", the ipecac scene is done in reverse, with everyone un-vomiting the vomit.
In Randy Cunningham: 9th Grade Ninja, radioactive candy is turning trick-or-treaters into zombies. To cure them, Randy has to make them vomit out the candy. Once he gets one to throw up, the others follow suit.