Lisa: Bart, water will only go the other way in the southern hemisphere.
Bart: What the hell is the Southern Hemisphere?
Lisa: Haven't you ever looked at your globe? [Tears off wrapping paper on a gift with a tag reading "Happy Birthday! Love Grampa" on it] See, the Southern Hemisphere is made up off everything below the equ... [stares at Bart] this line.
Bart: So say in Argentina, and Rand McNally [pointing at Rand McNally logo on globe], all their water goes backwards?
Lisa: Uh-huh. In fact, in Rand McNally, people wear hats on their feet and hamburgers eat people.
Bart: [impressed] Cool!