He didn't stop making that face all night long.
He held that pose all night.
This dude was so into his costume he went around giving everyone salmonella poisoning all night.
"He sat like that all night long. Until the music came on, that is."
He was blasting trashcans all night thinking they were R2-D2s.
There's plenty of Jokers, but Dent's a little trickier.