Answer:
There are 20 birds in a tree. A man comes and shoots one of the birds. How many birds are left?
How can you place a pencil on the floor so that no one can jump over it?
What coin doubles in value when half is deducted?
A claustrophobic person gets on a train. The train enters a tunnel just as it is leaving the station. Where is the best place for him to sit?
A man is able to contact his long lost brother who has never met. They agree to meet. When the brother arrives he is able to instantly pick him out from the crowd. How is that possible?
What never gets any wetter no matter how hard it rains?