Answer:
What goes up and down but does not move?
I am a kind of coat that can only be put on when wet. What am I?
I am easy to see, but no one likes looking at me. Without me, there would be no you. What am I?
What is easy to get into, but hard to get out of?
I am used when you jump off a bridge for fun.
What did the piece of wood say when he saw the screwdriver and screws approaching?