We had a couple of pranks we always pulled. The first one we would run a fishing line from the feeder into a bedroom window in the cabin and tie it to a can filled with nuts and bolts. Everytime a deer or bear would walk by the feeder that thing would wake your butt up and scare the crap out of the guy we would put it next to.

And of course in camp there is alwaysa guy that had to sleep on an air matress. Right after he would fall asleep we would open the valve just a bit and listen to him fight his way out of bed. Listen to him pump it up and wait for the snores and do it all over again.