The German toy/model company Conrad ran a TV advert featuring an amazing Rube Goldberg bike lock that used motorized skateboard wheels to raise your bike several meters off the ground and up a lamp-post; here's a making-of video showing the R&D that went into this fantastic gadget.
Die Bauteile zum Fahrradschloss aus dem Conrad-TV-Spot
(Thanks, Stelb, via Submitterator)