An electric guitar shaped like a Koopa Troopa. We're so glad these pictures exist, because we're not sure our mind's eye could imagine something as fantastical as "an electric guitar shaped like a Koopa Troopa" without some sort of visual aid.
Check out the Reddit entry to see the fruits of this unnamed magician's labor. Whoever you are, if you're reading this, please send a video of you playing this thing. Ideally to Iron Maiden's "The Trooper."