A man’s driving down the road with his son and they get in an accident. Two ambulances come and take the man and his son to different hospitals. The son goes into the operating room, the doctor looks at him and says, “I can’t operate on this boy. He’s my son.” How’s that possible?
"A shepherd has to cross a river with a sheep, a wolf and a cabbage. Only two can go on the boat. For example, the shepherd and the sheep. How can they cross the river without the wolf eating the sheep and/or the sheep eating the cabbage?"
"As I was going to St. Ives, I met a man with seven wives. Every wife had seven sacks. Every sack had seven cats. Every cat has seven kittens. Kittens, cats, sacks and wives. How many were going to St. Ives?"
"There are two doors. One leads to the castle, the other to certain death. You may ask one question, to one guard, to help you decide which door is the correct one. One guard always lies, and one always tells the truth. How do you choose?"