Answer:
How can you place a pencil on the floor so that no one can jump over it?
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?
What was the longest river in the world before the Amazon River was discovered?
There are 5 sisters in a room: Ann is reading a book, Margaret is cooking, Kate is playing chess, Marie is doing the laundry. What is the fifth sister doing?
They're actually great swimmers now, but later they will become excellent hoppers.