A man is walking with a sheep, a head of lettuce and a wolf. He sees a river and sees a boat. The boat can only hold two things, but if he leaves the sheep with the wolf, the wolf will eat the sheep, so he can't do that, and if he leaves the sheep with the lettuce, the sheep will eat it. How can he get across the river without anything being eaten?
This riddle is handed in by Zakaria.