Limecake said:
The Rocky Horror Picture Show, and get all your friends to dress up for a midnight showing.
It would at least be memorable.
Especially if they're rocky virgins and they see it at one of the raunchier locations. The De-virginization can be... traumatizing, if you see it for your first time at the wrong theater.
OT: I haven't seen them, but everyone's been raving about
Cabin in the Woods and
The Avengers. I'm kind of confused, though; why are you going to a cinema if you don't have a movie in mind?