Thor's hammer Mjolnir is probably the coolest weapon in comics, if not all of Western literature (okay, maybe tied with the Dobie-O-Matic from The Far Side). You can hit a guy with any old hammer, but Mjolnir can summon and shoot lightning. Not exactly something you can rig up in the garage.
Hack a Day's Caleb Kraft thought otherwise, and shoved an 80,000-volt Tesla coil inside a homemade replica of the hammer. The man now has a legit lightning spewing Mjolnir to go with his luxurious Thor-esque mane.
Mom, if you're reading this, remember it when my birthday comes around. [Hack a Day]