What's the best sight gag in a comedy?

@philwest The scene in Naked Gun where the lorry crashes into the firework factory and as everyone stares at the multicoloured, explosive mayhem, our hero says: "Move along folks – nothing to see here."
@monkey2, @smallwordsplease,
@alicol The house falling on Buster Keaton in Steamboat Bill Jr
@johnfoley The mirror scene from the Marx brothers' Duck Soup cracks me up every time.
@RockyRocastle The horse that appears to be Buster Keaton wearing a dress and umbrella in Our Hospitality.
@YoghurtWeaver In The Big Lebowski, when the Dude spends ages hammering a plank against the door and then the door opens the other way.
@VirtuallyPastit Take the Money and Run: Woody Allen's character Virgil is shown performing in a marching band – as a cellist.
@julian6 The grisly black comedy of the scene in the back of the potato truck in Hitchcock's Frenzy
@Pummeluffpapa The park scene in Top Secret! There's a massive statue of a bird, and on top of the statue there are some humans doing what birds often do on statues of humans in parks.
@Toadjuggler Steve Martin in Dead Men Don't Wear Plaid, cleaning his handgun in a sink with lots of bubbles and a bottle brush.
@EddieCoyle George Clooney and Tim Blake Nelson as the escaped convicts being pulled off the train they've jumped by John Turturro, to whom they're still chained, in the middle of Clooney's speech, in O Brother, Where Art Thou?.
@numpty2000 Bart's naked skateboarding dare in The Simpsons Movie.
@maid2 The train sequence in The Wrong Trousers, – an ingeniously constructed escalation of sight gags, with Grommit desperately laying train track before the runaway train. Brilliantly clever precision slapstick.
@DrJuliusNo Live and Let Die – Bond seduces Solitaire by having a tarot deck full of lovers.
@aargh Gene Wilder trying to walk in ankle cuffs in Stir Crazy.
@swanstep Busby Berkeley's Pettin' in the Park sequence with the escalating gags about roller-skating dames, cops etc.
@Gummibarchen The dance-off in Zoolander, between Ben Stiller and Owen Wilson, judged by the unsurpassably cool David Bowie.
@darrenlollipopman A drunken Father Christmas trying to eat a whole smoked salmon through his filthy beard on the back seat of a bus, not caring about the looks of disgust from his fellow passengers, from Trading Places – a scene of exquisite degradation.
@BlackChat The bit in Best in Show when the Eugene Levy character parades with the dog – we knew early on that he had two left feet, but this scene, where he can only walk in circles, reminds us of it again, visually.
@MawalTrees, @mervynreeves The sex scene in Team America
@TheKernel The hallmark "Luck of the Irish" sign falling on Patches O'Houlihan (Rip Torn) in Dodgeball.
@benmascari Anytime there's a shot of Leslie Nielsen from the neck down and he has this massively muscular, oiled-up body, in all the Naked Guns.
@Alicol Ken in A Fish Called Wanda, when he kills the dogs instead of the old lady – his reaction is hysterical.
@weeyin, @clearanceclarence, @Branwellbee, @backandtotheleft, @JacksSR, @MrMcGregor, @CameraPrincipis, @captainveg, @StephanoBentos, @timmaahh, @BadBoyBubby68, @numpty2000 William Shatner appearing from behind the "monitor" in Airplane II.