We support authentic cosplay as much as the next superhero-loving blog, but this re-creation of Thor's Mjolnir hammer that's capable of generating 80,000 arcing volts is just straight up scary. Instead of mystical powers, the hammer's lightning is generated by a tiny Tesla coil inside.
And if you're wondering what those sparks could do to someone, consider that your standard taser only generates about 50,000 volts. In other words, given anyone can come along and pick this up -- unlike the real Mjolnir -- you might want to think twice about building your own. Unless you're in costume and in need of a fantastic deterrent for touchy-feely types at comic book conventions.