Each year, Red Bull organizes Flugtag (flying day) events around the world, where participants build and pilot homemade flying machines. Flugtag challenges the brave and the brainy to design, construct and fly these machines off a 28-foot-high flight deck above a body of water. Entries are judged for distance, creativity, and showmanship. This criteria has inspired flying tacos, prehistoric pterodactyls, and all sorts of animals. The aerodynamics of these machines is questionable and most plummet into the water rather than fly. Here are some creative examples.