Today the prank on my roommate begins...
I wired up a bunch of tiny battery powered electronic devices that play random creepy sounds every few hours at random intervals. I built 9 of them and hid them in his room (like unscrewed wall sockets and stuck it in there, put it inside the lining of his bed, shit like that.. even put it inside the lining of his backpacks... there are 9 of them total