Answer:
What goes up the hill and down the hill, And spite of all, yet stand still?
What is the difference between yesterday and tomorrow?
Twelve pears hanging high, twelve men passing by. Each took a pear and left eleven hanging there. How can this be?
What is the only question you can't answer yes to?
How do you blink twice without blinking twice?
What did the piece of wood say when he saw the screwdriver and screws approaching?
Logic
Animal
Difficult
Easy
Food
Funny
Kids
What am I?