Because he is a tap dancer
Ten men were in a boat on the river Ganga. The boat turns over, and all men sink to the bottom of the river, yet not a single man got wet!
WHY?
A man is running down a hallway with a piece of paper in his hands, the lights flicker and the man stops, turns around and goes home, why is this?
I am hot, sometimes soft, sometimes hard, sometimes runny and loose, sometimes I float, sometimes I sink but whatever form I take on I always go out and never in. What am I?