Google "Dalek" if you don't know what that is. There was an ongoing joke on the TV show "Doctor Who" about fezzes, so I combined the two using an Arduino. Check out the video.
It was a hit on the official 50th anniversary convention! In future versions I'll add modes that control the blinking (button controlled, randomly or using relevant sensors) and perhaps the moving eyestalk.
It is currently controlled with a button and a potentiometer.