Another one I heard that may or may not be urban legend. If anyone knows for sure, chime in.

Two rednecks were heading down the road in their pickup truck. The headlights went out, and they discovered that a fuse had blown. There were no extras. They pull off the road and one of the bubbas decides to try and use a bullet in place of the fuse since they were close in size. It worked!

Riding down the road later, the bullet goes off. Pieces of it lodge in the driver's nuts.

Sounds far fetched, but I guess its possible. This supposedly was logged in the emergency room report when the injured dude went to the hospital.