Somebody has said or done something that bothers someone else. In retaliation, that person will toss a drink at them, pour something over their head or launch a solid piece of food.
Can be considered the Super Trope of Food Fight, although when done by adults a fight usually won't break out, outside of comedies (or westerns).
Compare Edible Ammunition, Pie in the Face, Tantrum Throwing. Edible Bludgeon is the more extreme version of this.
Jack splashes a glass of water at Oswald in Pandora Hearts when the latterbluntly tells the former that he is impossible to read and thus untrustworthy. Jack becomes extremely embarrassed after doing this this, however.
Gunslinger Girl. While Jean Croce was an officer in the Carabinieri, a female corporal fell in Love at First Sight with the handsome aloof officer. When she revealed this Jean responded by throwing an orange in her face. Her persistence eventually breaks down his Jerkass Façade however.
Films — Animated
In Disney's Aladdin, Jasmine throws a glass of wine in Jafar's face.
In Cocktail, Tom Cruise's character goes to the restaurant Jordan works at, and she responds by offering him the "Daily Special" - right on his lap.
In Hitch, after Sara finds out who Hitch really is, they argue and one of them throws a small piece of food at the other. He ends up tossing a salad on her.
The title character of Leonard Part 6 ends up wearing most of the meal when he dines with his estranged wife - both times.
In Freaks, a dwarf gets the remainder of a punchbowl thrown at him after offering it in the famous "One of us" chant.
Played for Drama in a 1985 Filipino movie where a jealous actress splashes water right in front of the heroine's face, added with the most remarkable line in Filipino film history, "You're nothing but a second-rate, trying-hard, copycat!"
Then in a later scene, the heroine food slaps her rival right in public as an act of revenge, added with the line, "A manos!"
Ayu in Deep Love pours hot coffee over Keiko, the girl who organised Reina's rape along with stabbing her in the leg.
Pretty Little Liars: Ben spills his drink on Emily after finding out she cheated on him with Maya.
A Song of Ice and Fire. Queen Cersei has a tendency to chuck wine in the face of members of her own family; so far Tyrion, Jaime and her uncle Kevan have copped it.
In Tales Of A Fourth Grade Nothing, part of Judy Blume's Fudge book series, Fudge becomes so irritating with his food strike and his becoming "the family dog" that the father takes him into the bathroom, sits him in the tub, and dumps a whole bowl of cereal over Fudge's head. From there came Fudge's favorite expression, "eat it or wear it".
Live Action TV
Samantha Jones, in an episode of Sex and the City, dresses in her finest and heads off to meet Richard, who's sitting at a table in very nice restaurant, waiting for her. As Samantha approaches him, he smiles and tells her how great she looks. She gives him a big smile back, tosses a drink in his face, turns on a dime, and triumphantly walks away.
On Happy Days, Chachi found himself eating in the kitchen (as there were not enough seats in the dining room). Richie has become mad at Chachi, and when Chachi asks for a roll, Richie throws it at him really hard. Chachi announces that he'll get his own gravy.
Bill has gone to sell the beloved trandem — however, it's rated as worthless by the bike buyers, who jokingly buy it for a tin of beans. When he comes back, Tim and Graeme inspect it, surprisingly calm, before pouring all the beans over Bill's head.
In "Punky Business", Graeme has gotten to work as a waiter in a punk restaurant. When Tim orders the sauce, he gets it all over his head.
In "Black And White Beauty", there's a literal food slap. Exposition: Graeme's running a place that takes care of old animals. Bill, after watching some of their behavior (nothing), starts doubting that they're alive. Bill watches a very unmoving cat, then this ensues:
Bill: Alright, Graeme. (produces a fish) I want to see that cat eat that kipper.
Graeme: Er—yes—oh, look! (points) The hamster's doing a handstand!
(Tim and Bill look away for a bit — when they look back, the kipper bone is sticking out of Graeme's mouth. Tim slowly pulls it out)
Graeme: Er...(turns to the cat) I'm sorry, Kenneth, I was just so—(Tim slaps him with the kipper)
Glee has the running gag of slushies to the face. It's mostly Played for Laughs, until Sebastian puts rock salt in a slushie, and Blaine gets it in his face.
Abed receives a drink in his face in the "Mixology Certification" episode of Community after he (kinda) leads on another man who was clearly attracted to him, so he could talk about Farscape.
The X-Files, "Within": Dana Scully tosses water on Agent Doggett when they first meet. Doggett is assigned as a task force leader to find missing Agent Mulder. He tries to find out some information on him from Scully, Mulder's partner of seven years. He doesn't introduce himself and messes with her, telling her some fake or very old Bureau's gossip that Mulder never trusted her and might have had secrets. He also hands her a cup of water. She figures out who he is and what he's trying to do, and that earns him splashing of the water in his face.
A Kids in the Hall sketch had Dave Foley and Kevin Mac Donald as two ladies' men who fondly reminisce together on all the women who have thrown drinks in their faces.
Another sketch has a salesman negotiating with a customer for a stereo (he wants $750, while the customer only wants to pay $1). At one point they take a break from arguing to have a drink. They then start negotiations again, leading them to simultaneously throw their drinks in each other's faces.
Eileen throwing a drink in her ex-husband Jerry's face becomes a Running Gag in Smash.
Conversed: Ted meets Robin at his favourite bar, and it's one-way Love at First Sight. Robin likes him too, but she says she's with friends; one of whom has just been dumped, so every guy is an enemy. They joke about how women in movies spill their drinks in men's faces in cases like this, and that it always looks like great fun.
Invoked: Ted suggests to Robin that she can do it to him to impress her broken-hearted, now-man-hating friend. She promptly spills her drink in his face, smiles and says that it really was fun.
Drinks to the face are an occupational hazard for Barney Stinson. "Eventually, you'll be able to anticipate it, and when you do... free drink!"
Sharpe: Richard Sharpe tosses two glasses of wine into faces of two jerkass officers who beat up a lady, and he wants them to ask him to duel.
One episode of Becker ends (and the next begins) with Chris throwing multiple drinks in Becker's face. Five, in fact.
An epic one happens to Jack at the end of a Three's Company episode when he secretly makes dates with two different women and his roommates, Janet and Chrissy on the same night and they all find out about it. They dump a bottle of wine and a bowl of soup dumped on his head, smash a cake in the face and a stuff a hot dog in his mouth!
House of Anubis- Pouring a drink on someone Patricia's favorite ways of getting revenge- she does it at least once every season, and it's been lampshaded on a few occasions. To elaborate, she did it in the premier to Nina, when she was trying to get information out of her, and in another episode to Amber when they told on her for trying to take Nina's locket. She poured milk on Eddie in season two for only dancing with her on a bet, and then in Season 3 she threw juice at KT and finally, poured juice over Willow. (She was a sinner in the latter case, however.) In the finale movie, she TRIED to do it twice, but was stopped on both occasions.
She also attacks Eddie with creamed carrot when he accidentally got some on her shirt. This started a food fight.
KT once threw her cereal at Patricia, in response to Patricia throwing juice at her.
In the video for Pat Benatar's "Love Is A Battlefield", after Pat's character sees a fellow dancer at a nightclub she worked at get mishandled by their boss, she retaliates by throwing a drink into her boss' face before she and all the other workers leave the nightclub.
In a FoxTrot arc centered on Roger attending his college reunion, one strip opens with a woman confirming that he's Roger Fox, from the Delta Theta fraternity, at which point she says "After all these years, I can't believe I found you!" ...And then promptly throws her drink in his face, calling him a pig. And as this is happening, another woman walks up, asking "Roger Fox?"
Welcome To Sanditon: Edward gets hit by ice cream when he and Clara have an argument over her ice cream shop which the Mayor wants to turn into a juice bar.
Greedy throws food at Brainy to get him to shut up about critiquing his cooking in The Smurfs episode "Gingerbread Smurfs".
The Looney Tunes Show: Daffy remembers doing this to Porky at high school by pushing a plate of cake into his face. As it turns out, it was actually Big Man on Campus Porky who pushed the cake into Daffy's face.
Blueblood: Stay back! I just had myself groomed! Rarity: Afraid to get dirty?!
In the American Dad! episode "Franny 911", Francine slaps Roger in the face with a bass after he (among other things) throws it at her shoes.
In "Office Spaceman", a flashback shows nuns hitting Francine with a fish at her old orphanage (It was usually a head of beef, but this was on a Friday).
T.U.F.F. Puppy episode "Freaky Spy-Day", Dudley does it to Jack by spilling water at him, and putting ketchup and butter to his face; all while being in Kitty's body.
Family Guy: In "Play It Again, Brian", when Peter calls Brian out on his inability to sustain a relationship Brian throws his drink at him.
February 4th (2010) Lindsay Lohan went to see her ex, Samantha Ronson spin at Crown Bar in West Hollywood. It was reported that "Lindsay was trying to get Sam's attention, but Sam was working and apparently ignored her...Lindsay began 'dirty dancing' with a girl in front of Sam, who then became infuriated and called Lindsay 'a disgrace," after which Lindsay picked up a drink and threw it straight in Sam's face."