A while ago a company called Necomimi combined some sort of transcutaneous sensor with a few other things to create these apparently thought-controlled cat ears:
they've taken the same idea and linked it to a tail, plus a smart-phone
geo-tagging system of some description:
I can't watch either without laughing out loud; both look utterly silly, but
a nice way to lighten an afternoon.
The thought also occurs that a
certain Barry Tadcaster's act might be greatly improved were he to wear these
whilst on stage...