Revenge of Left Shark is an interactive rhythm and dance game. In other words, DDR with your hands. The game uses computer vision to place the player on the beach, supply visual cues and provide real-time scoring information.
I made a gas pedal-style video speed controller / interface in Max/MSP. When you press down on the mouse, it accelerates the playback speed of the video. When the mouse is released, the throttle eases back towards 1x speed:
The acceleration rates and deceleration rates can also be changed with the two sliders in the middle.