Heh, my favorite Delirium moment would be when she's trying to get into Lucifer's night club to talk to him near the end of the series. Lucifer's lover, the half-faced demoness waitress Mazikeen won't let her through.
Delirium's response? "Hmph. If you don't let me in, I will turn you into a demon half-face waitress night-club lady with a crush on her boss, and I'll make it so you've been that from the beginning of time to now and you'll never EVER know if you were anything else and it will itch in your head worse than little bugses."
My brain nearly implodes every time I try to think about whether she did or didn't... She really is insanity itself.