This is a video from Youtuber Sufficiently Advanced of him building a magnetic Thor's Hammer that only he can pick up by deactivating the electromagnet using a fingerprint scanner (although one smartass at the very end does manage to rotate the whole thing off a manhole cover and then pick it up). It is like a modern sword in the stone. Except, instead of becoming King of England if you can lift it, you get to star in this Youtube prank video. Man, the prizes for these things have really have gone downhill over time.
Hit the jump for the video.
Thanks to Clem, who could have easily removed that hammer even if it meant tearing the earth's whole crust off.