That reminds me of two things. I have a buddy who is (or was) ther real deal back in the day. On one of his many secanol fueled adventures, he stole a real skeleton from a medical lab, you know one of those that hang up. Rode it around on his purple knucklehead. Still has it thirty years later, takes it out for Halloween and ridesit around, still on the same knucklehead.
Ed Roth had a shirt in the late 60s' with a guy on a purple pan with a female skeleton, I always wondered at any connection since they both happened here in So.Cal.