This prank has it all. It's easy to do, requires few materials, won't cause physical harm to anyone or anything (hopefully), and will absolutely terrify your victim while amusing you for days. All you need is a securely passed-out person and a big box (flat piece of plywood optional). You cut out one side of the box so that it will cover the sleeping person like a coffin, then pound on the top to wake them. They will likely think that they have been buried alive and flip out like the guy in this video.