A bit-part actor finally got his first leading role in a major film. In one scene the actor had to jump off a high diving board in to a swimming pool. He climbed to the top of the board, looked down and promptly climbed down again.
`What's the matter?' asked the director.
`I can't jump from that board!' said the actor. `Do you know there's only one foot of water in that pool?'
'Yes,' said the director. `We don't want you to drown, you know.'