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Everybody up at 3 AM for a field trip to Springfield Glacier. That is, everybody up except Lisa, who falls for the "enjoy your trip, see you next fall" gag twice, courtesy of Bart. At the glacier (or what's left of it, anyway, as most of it seems to have melted), while Mrs. Krabappel demonstrates to Principal Skinner that their relationship is over once and for all, Bart sneaks a walkie-talkie behind Lisa and, while Lisa laments the loss of the glacier because of global warming caused by gaseous emissions, Bart supplies the appropriate sound effects. Lisa has had it, and gets a restraining order requiring Bart to keep at least 20 feet away; unfortunately for Bart, this means he has to live in a tent outside the house, and can only attend school inside of Willie's shack. When Marge tries to get Judge Harn to lift the order, Bart makes the wrong comment, and now it's 200 feet, which means Bart now lives in the woods behind the house.
Meanwhile, Homer discovers that Grampa is a greeter at Sprawl-Mart ("not a parody of Wal-Mart"), but when Grampa tries to free a stuck shopping cart and ends up crashing into a pile of gnomes, Homer takes over, and soon discovers he has a talent for the job - but not a talent for being locked in the store all night like the other greeters.