Answer:
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
I get paid to shoot people then blow them up.
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain; doing no harm, and feeling no pain. What am I?
I am always in front of you, but you will never see me. What am I?
What comes once in a minute twice in a moment but never in a thousand years?
What did the piece of wood say when he saw the screwdriver and screws approaching?