Darth Vader finds your lack of faith in his ability to play the Imperial March on the bagpipes and ride a unicycle at the same time disturbing.
Not only can he totally pull off that stunt, but his new mechanical legs are incredibly lifelike. Just don't ask what's under the kilt.
This multi-talented Sith Lord is actually Brian Kidd, aka "The Unipiper." He appears at events both as Vader and in a slightly-more-normal outfit topped with a fedora.