The entire interrogation scene. The best part is the cops' disturbed reactions to what they consider Ted's blasť attitude to "admitting" that he is a serial killer throughout the scene.
You son of a bitch...you're gonna fry. *slams Ted's head repeatedly on the table*
"Is that the frank or the beans?"
Everyone's reactions to Ted's little snag. Mary's stepfather instinctively clutches his groin when he sees it.
Healy spying on Mary changing:
Healy: (sees Mary about to take off her bra)Oh-ho-ho yeah...Here comes the money shot!
(Healy switches to a bigger pair of binoculars and sees a pair of saggy leather breasts)
Healy: *shriek* First chink in the armour, Ted!
When Ted is telling his story to his shrink, we see he'd gone out for lunch while Ted's back was turned, then managed to con Ted into booking another session by suggesting he might have latent homosexual tendencies.
"I get a high from helping all of God's creatures." *smashes a bug*
"STAY AWAY FROM THE LIGHT!" "Okay, I'll just get you a regular."