Homer: OK, so we can't go over the fence.
Marge: I feel so helpless. What if something happens to them?
Homer: I'm sure they're fine, honey.
Marge: Well, at least they're wearing clean underwear.
[cut to Bart's bed at home, where his underwear is still laid
[inside the base]
Bart: Free and easy, Lis...aaah. There's nothing like an unfurnished
basement for pure comfort.
Lisa: Huh? Hurry up, Mom and Dad are probably worried sick.
-- More tenets of the Bart philosophy,
"Sideshow Bob's Last Gleaming"