These guys are brilliant! This doesn't even seem like a prank to me. It's more like the best present ever.

When their friend is out, they change over all over all of his plumbing so that the faucets pour beer. There's even beer coming out of the shower heads!

By the way, if any of my friends want to do this to my house, feel free! I won't be angry at all...my wife probably would...but you won't catch me complaining!