I saw the midnight showing of A Rocky Horror Picture Film with my friends and it was the greatest night of my life.

People had skits that went with the movie, and one person threw toast, and they even interacted with the screen, by actually touching it.
And some young skinny guy stripped to his underwear and was flexing his muscles in front of the audience (playing Rocky)
OMG the later in the movie, the more funny everything seamed. XD
Except that the movie kept stopping randomly cuz the projector was crap.

that was sad.