While this might get you thrown out in the cinema, it is extremely amusing to do at home:
When a group of friends is round and you're watching one of the EE's (that they haven't seen before) leave the room a couple of minutes before a bit that might make you jump is on, and then just as it happens burst back through the door and scream. The combined effects make for some truly hilarious reactions
But don't do it if any of them are bigger than you. Pain follows