Fisto!

An unarmed weapon first revealed in IGN's week of Fallout 3 coverage, the Fisto! has been described as multiple shards of metal wrapped around the player's fist. Used in V.A.T.S., a critical strike results in a brutal uppercut, sending the enemy into a backflip.

One can be found in a power plant northwest of Minefield. It is a basic weapon that is said to be handy in a last ditch effort.