A man weighing 14 stone and his two sons weighing 7 stone each were stranded on an island. All they had to get off the island was a small boat, but it could only hold 14 stone. How did the man and his sons get off the island?

The two sons get in the boat and go back to shore, one jumps out, the other rows back to the island and gets out. The dad gets in and rides back to shore where he jumps out and the other son gets back in. The son goes back to the island and collects the other son and together the two of them row back to the safety of the shore!