Rule #49 Do Not Stick Explosives in Your Butt

Prisoner caught with grenade where?

Guards at the San Francisco Gotera prison outside the capital San Salvador found the V40 grenade, about the size of a golf ball, lodged up the man's rectum during a security clampdown, a prison spokesman said on Thursday.

And yes, they did actually say clampdown. And 16 other inmates, the lucky ones, got to swallow cell phones instead of stick a grenade up their butt.

Rule #49 is Do Not Stick Explosives in Your Butt.