Answer:
What begins and has no end? What is the ending of all that begins?
A circle of stones, never in rows. Stacked one on the other, mystery it sows. What is it?
What is the thing which, once poured out, cannot be gathered again?
A man went to a place on thursday on his horse, he came back 3 days later on thursday how is this possible?
There are 30 cows and 28 chickens. How many didn't?
What did the piece of wood say when he saw the screwdriver and screws approaching?