One of my favorite episodes, "Bart After Dark" has some great lines.
(Forgive my quoting, it's all from memory)
: "It's Eleven O'Clock. Do you know where your
: "For the last time, no! Where is Bart anyway? His food is getting cold... and eaten."
: "Are you wearing a grocery bag?
: "I have misplaced my pants."
: "Ah, there's no justice like angry mob justice"
: "I'm going to burn all the historical memorabilia!"
: "I'm going to steal me a toilet!"
: "Ach, there better be two!"