This is a fantastically well done mocu-mentary about the design and construction of some impossible amusement park rides. It's also very funny! I love how in videos like this, your brain, in fast thinking mode, assumes the reality of what it is perceiving. After a few clues the slow thinking part of your brain begins to pick out the holes in the illusions.
Directed by Till Nowak. YouTube link. h/t to Neatorama