I have so many favorites! When Lisa and Burns try to use his panic room to get away from a mad beast, Burns can't remember the password. It then asks for his place of birth and he types in "Pangea"
Also, my favorite lines:
Ralph: "My cat's breath smells like cat food!"
Marge: (At Costco-style bulk store) "Hey, this is a good price for ten pounds of nutmeg."
Miss Hoover: "Children, put your heads on your desks and take a nap."
Ralph: "Yay, sleep! That's where I'm a Viking!"
Lisa: "You can use a lot of things to relax, Dad: Tai chi, Chai tea"
But my favotire random moment is when Homer is on trial for his soul with the devil and the devil arranges a who's who of evil as the jury. However, Marge runs out of chairs and you can see Lizzie Borden teetering around on Lisa's ergonomic desk chair. Gets me every time.
see it here:
http://www.hulu.com/watch/23428/the-simpsons-jury-of-the-damned