Attempting to set a Guinness World Record? Nailed it. John "Hammer Head" Ferraro is one guy who doesn't mind being called a numbskull.

The Boston-area man set his record by pounding 38 nails into a board with just his skull in under two minutes. Hammer Head also holds the record for one-minute with 13 nails and the record for most concrete blocks broken on the head with a bowling ball in three minutes at 45 blocks.

Ferraro's skull is actually twice as thick as an average human's. He discovered that as a kid when he went head-first through a door.