PLANET OF THE APES. BtVS Intertext/Allusion.
"When She Was Bad" opens with Willow and Xander playing a game of "Name the Movie," quoting famous lines from movies:
Xander: Um, oh, okay, I got one. (imitating Charlton Heston) "It's a madhouse! A mad . . ."
Willow: (interrupts) Planet of the Apes.
Xander: Can I finish, please?
Willow: Oh! Sorry, go ahead.
Xander: ". . . house!" (indicates she may answer)
Willow: Planet of the Apes.
Planet of the Apes was a 1968 film starring Charlton Heston about an astronaut who crashes on a planet on which apes are the ruling species and men are their slaves.