Clockwise. It's called the Coriolis Effect.

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: Bart: Go, toothpaste, go! Move your pasty white butt. : Lisa: Come on, shampoo! You can do it! : [both swirl down the sink, shampoo first] : Yay! I won your stupid bathroom products race. : Bart: No fair! You only won because you had the inside track. If the : water was spinning the other way -- : Lisa: It _never_ spins the other way. In the Northern hemisphere, : water always drains counterclockwise. It's called the Coriolis : Effect. : Bart: No way. Water doesn't obey your _rules_: it goes where it : wants...like me, babe. : Lisa: Yes, _Bart_...why don't you try it and see? : [Bart turns the tap on; water swirls counterclockwise] : Bart: I _know_ I've seen it go the other way. Ah, faithful toilet: : you'll prove me right. : [flushes it repeatedly; groans as it swirls counterclockwise] : Homer: [elsewhere] I'm a singin' in the show --! Ow! Hot...aah! Cold! : Oh! Hot! Cold! Hot! Oh! Who's...doing...that? : Marge: [walking into upstairs bathroom, seeing Bart pushing the water : the other way] Oh, for Pete's sake, Bart, use the plunger! : -- Marge, uncharacteristically, misinterprets Bart's behavior, "Bart vs. : Australia" : Lisa continues to try to explain the observed phenomenon to her less- : than-brilliant brother. : Lisa: Bart, water will only go the other way in the Southern hemisphere. : Bart: What the hell is the "Southern hemisphere"? : Lisa: [sighs] Haven't you ever looked at your globe? : [said globe is still wrapped for Bart's birthday from Abe] : Lisa: [pointing] See, the Southern hemisphere is made up of everything : below the equa -- : [stops, sees Bart looking blankly] : -- this line. : Bart: Hmm. [spins globe] So down there in, say, Argentina, or...[reads : logo] Rand McNally, all their water runs backwards? : Lisa: Uh huh. In fact, in Rand McNally, they wear hats on their feet : and hamburgers eat people. : Bart: Cool! : -- Impressionable youth, "Bart vs. Australia"

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