The hand maintained by a cat owner who is allergic to cats. The cat owner must be careful to use the cat hand only for touching the cats or risk a terrible allergic reaction. Hand washing will return the cat hand to regular-hand status.
Guy 1: Dude, what happened to your face? Did you get stung by a bee? Like, in the eyeball?
Guy 2: Nah, I just had an itch and accidentally scratched with my cat hand.