Tweedle-dum and Tweedle-dee

A man went for a walk along a beach and came across two shells. They were like nothing he had ever seen before. The man bent down to pick them both up but realised they were too heavy for him to take both of them. He picked up the prettier looking shell and went to a shop to get it valued. The shell was worth a small fortune. The man was very content with his shell, so went home to display it on his shelf. What the man didnt realise was that the shell he had left behind, would have been worth a lot more than the shell he had choosen, as that shell had a beautiful pearl inside.