Certainly not the sharpest marble in the jar, this guy.
Speaking of pranks, I know a couple of young guys who were roommates in college. Their pranks on each other were legendary.
One of them started off easy by putting Seran-Wrap stretched tightly over the toilet so when his buddy took a leak in the middle of the night, urine went everywhere.
This escalated over the next few weeks and culminated with one of them dribbling a heavy line of flour on the top of the ceiling fans fan blades in the other's bedroom. He then preselected the fan to high and waited for the roommate to turn it on. You can imagine the white cloud that ensued once the fan blades started turning!