(Though it's good, honest work if you need it.)

This is the prosthetic human equivalent of those algae-eating surface sucking fish you see in large aquariums.

My kids were staring at couple of these fish working the tank in a Chinese restaurant once - forget all of the gorgeous tropical fish whirling around, they just wanted to see those sucker mouths roomba-ing the side of the tank from the other side of the glass.