I played a prank that freaked the hell out of one of my friends. One night, I knew he was going to watch "The Ring" over at a friend of mine's house.

I got the friend of mine to tell me when the movie was over, and then I called that home. My friend picked up the phone and I said "Seven days..."

My friend was so freaked out that he posted this on some other forum, but then I told him it was me, and he calmed down.