Answer:
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
You cannot keep me until you have given me. What am I?
The person who makes me doesn't need me. The person who buys me doesn't use me. The person who uses me doesn't know it. What am I?
I get paid to shoot people then blow them up.
Although it sounds like I work on a transportation device I actually work in a restaurant.
When is it bad luck to see a black cat?