If you stepped on the wrong tile, it would push down on a hidden lever. This would release a string, which ran under the floor and up to a series of crossbows. Once the string snapped back, the arrows were triggered, shooting right at the spot where you stood. Now, you might think this only exists in movies, but according to legend, one ancient Chinese tomb actually uses this booby trap. Only no one's ever dared to open it and find out.