That is brilliant and hilarious. Is he a hand puppet? Either way, he's a perfect addition to your crew.
No, he's a strap-on. Literally. He straps on to one's leg, or in this case, a beer tap, and has his way with you. One can't help but feel a little dirty and used after watching Humphrey do his thing, but, oddly enough, one can't get enough of it, either.