Answer:
Two fathers and two sons are in a car, yet there are only three people in the car. How is this possible?
Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?
A town has only two barbers. One of the barbers has a nice, tidy haircut, and the other has a shaggy, messy haircut. Which barber should you go to?
What always comes into a house through the keyhole?
No is to negative as yes is to...?
What goes around and around the wood, but never goes into the wood?