I don’t know if “prank” is the right word to describe what I’m talking about, since it didn’t really start out as a prank on my part, and the way it all turned out was certainly not how I could have predicted or planned, but it wound up being damned funny.
Back in the summer of '88, my friend John and I moved in to an apartment with his friends Dave and Greg. It wasn’t a bad apartment, as far as first college apartments go. Dave had been living there for a while, and John and I moved in when Dave’s roommates moved out. The living room of the apartment had sliding glass door which led out to the parking lot, and there was a light on a pole near our apartment, and at night, this light flooded the living room,even when the curtains were drawn (this is somewhat important later on).
At some point during the summer, John or I bought a small bottle of glow in the dark paint, and since the walls of the apartment were white, we amused ourselves by painting various mystical symbols on the walls (the glow in the dark paint didn’t show up on the walls when dry). He and I did this when our other roommates weren’t in. John and I thought that it’d be cool as hell at night to see the symbols glowing on the walls. We didn’t mention it to our other roommates, since we figured they’d get bent out of shape about it (not realizing that the paint was water soluable, so it would come off easily).
Much to our dissappointment, the pole light was so bright at night, that you couldn’t see the symbols glowing. (One other thing I should mention is that Dave had a black velvet painting of a Mexican on a burro on the wall opposite the couch. I touched up all the white areas on the painting with the glow in the dark paint.) Still, John and I had fun doing it, and we forgot about it as things soured between us and the others. Eventually, John and I moved out to another place, and Dave and Greg found a couple of roommates to replace us.
About a month or so after John and I had moved out, John got a call from a friend of his, who’d been over at Dave and Greg’s apartment the night before. They’d had a small party, which presumably went well until a nasty storm blew up. This kind of unsettled everyone and they sat in the living room, watching the storm wreak havoc outside. At one point during the storm, Greg gets up, walks over to the sliding glass door, and stares out at the rain. Right after a big flash of lightning, Greg spun around and said, “You know, this is no ordinary storm.”
Immediately after he said that, there was another flash of lightning and the power went out. The apartment was pitch black except for the light coming from the storm. Everyone was pretty unnerved by that, then they discovered John and mine’s artwork all over the walls and on the painting. Evidently, the guests all felt a compelling urge to leave at that moment. 
Now, John and I never told anyone about what we had done to the walls, and there’s certainly no way that Greg could have predicted that the power was going to go out at that moment, but it all worked out perfectly as far as John and I were concerned, since it so creeped out some of Dave and Greg’s friends that they refused to go back to the place. 