I know someone who apparently can't resist the attraction of Mario. I can't blame her. I don't know if it is the moustache or the mushrooms, but I share the feeling. That's why I like this sound-enabled Mario costume.
The costume uses an Arduino system connected to an Adafruit WaveShield. Sensors trigger the sound with different moves. It only needs a soundtrack, but you can always do it with your mouth, which is how I go around in life: Singing the Super Mario theme, dressed on my Mario raccoon suit. It doesn't make any sound, but I can fly with it. [Adafruit via Make]