This instructable will show you how to merge a Mario Bros. sound FX keychain with an NES controller to make a belt buckle with sounds from the original Super Mario Bros. This is also my sister's Christmas present, so don't tell her!
Here's a video of the belt buckle in glorious action:
Hardware: NES Controller Super Mario Bros. FX Keychain (available online, $5-10, I got mine at Hot Topic for $10) On/off switch (I got 2 SPDT switches from Radio Shack for $2.50) Belt buckle, belt buckle blank (available from craft stores), or wire hanger
Equipment: Soldering Iron (& flux, solder, etc.) Hot Glue gun Dremel or some other tool for cutting the controller board Wire strippers & scissors Small phillips scredriver Drill w/ 1/16" bit