OK, this one moves outside of the realm of “harmless prank” and into “truly disturbing,” so let’s make it the last one we do. In 2010, a Chinese chef Zhang Dajun went out drinking with friends and had a little too much fun. After he passed out, his friends thought of wacky things to do with his slumbering body, as friends do all over the world. But instead of drawing on his face with a Sharpie, they took a live eel and put it into his anus. When he woke up, his butt started to bleed and he was hospitalized. It wasn’t until after he died that doctors cut him open and found the sea creature in his digestive tract, and his friends 'fessed up to the vile prank.