I wanna scare them. They're really freaked out about ghosts but me and my friend'* girlfriend are so interested in ghosts.

Any ideas how I can scare them using ghosts or ideas of ghosts?

The roommate is EASILY scared...

wear a bedsheet over you head and run around

and stay away from staircases

watch "Premonition"

its not supposed to be a scary movie.. but i literally jumped 5 times during the movie

Take them to a haunted area by you. Me and my friends did this one time, we took a few people that didn't believe into a haunted cemetary. Needless to say by the time we left they were scared shitless

I would take them to a haunted place like Leslie suggested. I've had a few encounters that left me frozen with fear. My friend and her family had to move out of that house suddenly because whatever was haunting it was starting to get more hostile. I never would have believed it unless I experienced it firsthand.

Sounds like a plan to me. take them somewhere haunted. It'* peaked my interest a few times as I'm skeptical at times, but seeing it first hand would probably make me a believer!

any old abandonded farmplace will work...

go around midnight and have a friend already there.. have him slowly close a door upstairs and then tell them you want to go upstairs...

I see it as the best way to go about it really. I believe in ghosts and spirits and whatnot. Me and my friends have gone to a dozen places around here, and there is 1 place the scares the crap outta me every time we are there.

Too bad you weren't in Winnipeg I'm part of a group called Winnipeg Ghost Trackers. We could help scare them easily

Hold a seance
have you and another 'assistant' ready to scream and swear that they just saw something wallk into scaredycats room. Have the assistant act super scared and leave the house and refuse to come back in. He just knows that the thing thing you both saw is 'lookiing for a new body'.

Mr Fraidypants won't sleep in his room that night. LOL