I think one of my fav eps was The After Hours, where a woman goes to return a gold thimble, and gets stuck in the department store after hours.

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited