A Vonage commercial showed a couple discussing how their current phone company's fees are robbing them blind, while black-clad and domino-masked thieves steal everything they own, kitchen sink included.
An old McDonald's commercial featuring Ronald McDonald and the McDonaldland gang featured them going on vacation; when they got home, Birdie exclaimed that they had "seen everything but the kitchen sink". Ronald said he'd "fix that", and pulled a lever that caused the kitchen in his house - what they were in - to "sink" about ten five feet into the ground. "Now we've seen the kitchen sink," chuckled Grimace. (The whole commercial had been a Hurricane of Puns.)
A Disney Adventures comic featuring The Mighty Ducks used this line when a brainwashed hockey crowd was attacking the team. "They're throwing everything at us but... [clang] The kitchen sink?"
Demon #25, one of the many, many origins of Etrigan. Advertised as including an unneeded Lobo poster. The Demon and Lobo were beating the tar out of each other with every single weapon imaginable, including said sink.
The Return of the Jedi parody has an unseen crewman on a spacecraft pointing out that the battle around the Death Star has everything but the kitchen sink. The person he's speaking to points out that there is indeed a kitchen sink in the battle (which you can even see in the panel) but not to worry because "The sink's on our side!"
Their Lost in Space parody also featured this, although there the sink simply crashed nearby.
Negaduck and Magica Da Spell spend 'Crisis on Infinite Darkwings', the second Darkwing Duck comic arc, 'recruiting' various Darkwings; all they can find. In one big splash panel showing off their work, you can see ... Darkwing Sink.
Yellow Submarine - Old Fred opens up a cupboard door and lots of unlikely objects fall out, including a kitchen sink.
Top Cat and the Beverly Hills Cats: Humorously subverted, then played straight at one point, as the title cats wind up getting a bunch of junk dropped on them from above. One cat remarks that they've had everything thrown at them but the kitchen sink; the next object dropped is a grand piano. T.C. yells at them: "He said, the kitchen sink!", with predictable results.
Films — Live-Action
The opening battle in Star Wars: Revenge of the Sith was so complex one of the people on the team said they had put everything in it but the kitchen sink. They then proceeded to rectify that. Watch closely, specifically the shot where we fly by a CIS ship as it breaks apart and a piece of debris smashes into a nearby Republic ship. That's the kitchen sink.
In Abbott and Costello: Lost in Alaska, while throwing things at the bad guys to keep them from advancing, Abbott says they've thrown everything but the kitchen sink. Guess what Costello does.
Occurs in Garfield's Pet Force. When Binky the magician declared "found it!" after a comment about the kitchen sink, it was the sink that he found, not the object he was looking for.
In one of the Vlad Taltos novels, a barricade assembled by Easterners to seal off South Adrilankha incorporates all sorts of furnishings, including a kitchen washbasin. Actual sinks haven't been invented yet.
In Aunt Dimity Slays the Dragon, Bill lifts the day pack Lori prepared for the family outing to the opening day of King Wilfrid's Faire and gives a low whistle:
"I hope you remembered to put the kitchen sink in here," he said. "We may have to wash King Wilfrid's dishes before the day is through."
"I knew I forgot something," I said, snapping my fingers. "Wait here. I'll run in and get the sink."
In the M*A*S*H episode "Sticky Wicket", Hawkeye is repeatedly disturbed while hiding in a tent. When two orderlies enter carrying a crate, he loses his temper:
Hawkeye: What's going on here? Just because I want some privacy there's everything in here but the kitchen sink! What's in there? Orderly: Kitchen sink, sir. Hawkeye: Out! Out!
In the "April Fools" episode of Mama's Family, Thelma Harper plays a prank on her family by filling the front lawn with junk from the garage. Shocked at the sight, Vinton says, "Mama, you've got everything out here but the kitchen sink!" Just then, Iola wheels out said sink, asking Thelma, "Where do you want it?"
Red: So all you need is stuff you probably have lyin' around: A gas lawnmower, a downspout, a car alternator, 45-gallon drum, ceiling fan, chunk of garden hose, and some corn stalks. Now you're probably saying, "Geeze, Red, you're using everything but the kitchen sink!" Well, you're wrong! [reaches behind drum, pulls out kitchen sink]
Invoked in a Dirty Jobs segment set in a scrapyard; since kitchen sinks are all stainless (and weigh several pounds), they're actually not all that rare in context.
One time on Extreme Makeover Home Edition, as they were going about demolition Ty Pennington says "We're throwing out everything...." cue kitchen sink flying out the first floor window "...and the kitchen sink!"
One time on Clean House, Niecy goes "We're throwing out everything but the kitchen sink!" Gilligan Cut to Trish Suhr throwing a kitchen sink to which Niecy responds "Well shut my mouth!"
One episode of The Monkees had them under fire from a pack of rustic, gun-wielding maniacs. They do indeed throw the kitchen sink at the Monkees... or rather, they wheel over a sink with a lit stick of dynamite on it. One Monkee responds by turning on the faucet of the sink (which still works, somehow) to drown the dynamite.
Some versions of emacs - a text editor at heart that has gained a bewildering array of non-text-editing functions over the decades (notably Tetris) - use a picture of a kitchen sink as the program's icon.
Some versions of the Super Nintendoemulator ZSNES include the KitchenSync, a VSync option specifically calibrated for monitors that refresh at 120 Hz.
One issue of Dragon Magazine had for its cover a picture of a dragon's hoard, which contained gold, jewels, and many, many less conventional objects. A kitchen sink was among them.
One portion of The Eighth Voyage of Sinbad show at Universal Islands of Adventure has one character fighting a monster, with both fighters pulling out various objects. Eventually, one of them pulls out a kitchen sink, causing them both to stop for a moment out of sheer confusion. Predictably, the one holding the kitchen sink then clocks the other with said sink.
In JoJo's Bizarre Adventure Abridged, Diostops time and throws more and more knives at the frozen Jotaro until there are too many for him to block or avoid. Before starting time up again, he adds, "And for comedic effect..." and a kitchen sink gets photoshopped into the scene.
Dog: Gee whiz! He hit me with everything but the kitchen sink. Screwy: Well, don't want to disappoint ya, chum. (hits him with kitchen sink)
That joke was the capper for a scene which featured Screwy hitting Meathead (the dog) with a bunch of items found in a steamer trunk labeled "Assorted Swell Things To Hit Dog On Head."
In Bad Luck Blackie, the antagonist dog was cursed with bad luck to get hit on the head by items. He is hit by a kitchen sink from nowhere fairly early on in the cartoon, and it only got sillier from there.
Hey Arnold! has an episode in which the kids are in a tree and trying to prevent a bulldozer from cutting it down by throwing stuff in its way, without success. Sid comments that they've "thrown everything but the kitchen sink," then promptly throws the kitchen sink. Which also fails.
In one episode when Baloo and the others are on the run from the law and being chased through the sewers, the police try to stop them by stuffing things from stop signs and lights to a tree down manholes. Baloo then comments that the police used everything but the kitchen sink. They then dodge a kitchen sink, after which Rebbecca comments on Baloo not giving them ideas. Baloo replies at least it wasn't a bathtub. One then falls on top of the Sea Duck and Rebecca yells at Baloo to stop talking.
Another episode has pirate Don Carnage send his two main henchmen into the city, telling them to plunder everything even the kitchen sink. Later on, the heroes have a confrontation with a giant squid who accidentally ripped a sink out of the kitchen and dropped into the henchmens' submarine. Don Carnage is not amused when they bring it to him.
An episode of Aladdin: The Series features Genie fighting a magical demon named Aziz who was a Big Eater, eating everything Genie throws at him. Finally Genie comments "It's come to this" as he materializes a kitchen sink.
In "Suited for Success", bigwig fashion designer Hoity Toity calls the dresses at Rarity's first fashion show a "piled-on mishmash of everything but the kitchen sink". Cue a thoroughly-embarrassed Rarity hiding a kitchen sink behind the curtains.
One of Spike's presents in "The Secret of My Excess" is a kitchen sink... for no reason other than this trope. (The entire hoard was full of props from previous episodes to begin with.)
Sweetie Belle uses one among other things to build an emergency barricade in "Hearts and Hooves Day".
The episode "The Contender" of The Adventures Of T-Rex had one of the titular T-Rexes in a boxing tournament. One of the villain's mooks begins to throw various objects at him, causing the referee to yell "Foul!" The mook's coach then runs in and says "My boy's hitting him with everything but the kitchen sink!" In the background, the mook then picks up a kitchen sink and tosses it at the T-Rex.
In the episode of Rocko's Modern Life where Filburt is Mistaken for Aliens, Rocko and Heffer build a blockade in front of the door using every heavy object they can possibly find, including the kitchen sink.
Narrator: Boy, we've had everything in this episode but the kitchen sink!
Bullwinkle: (pulling one out from behind him) What do you suppose *this* is?
George of the Jungle: Dr. Chicago once created an army of plant monsters to loot the area. He commented they took everything except a kitchen sink. Then one falls from a loot bag and he commented "Spoke too soon".
Variation in the Teenage Mutant Ninja Turtles (1987) episode "The Maltese Hamster" where Donatello commentates like a Hardboiled Detective throughout the episode: He mentions that the gang they are in pursuit of "Took everything that wasn't nailed down - and even a few things that were."