Back in the seventies, I had two ferrets, Biggles and Fang. (Named after the rogue Bishops in Monty Python's Flying Circus.)

Biggles was pretty gentle, but Fang thought of nothing but food. One day he grabbed the skin between my thumb and forefinger in his teeth. Not enough to hurt, but enough to be able to start pulling.

I thought this was interesting, so I let him pull me wherever he wanted to go. He pulled me right over to the corner where he use to like to eat his food.

I guess he thought he'd hit the jackpot.