This is an interesting variant on a several-times-used pun.

The little cabbage in the field was consulting its mother about life.

“Life,” said the mother “is a gamble; you’ve got to withstand storms, drought, wind, animals–not to mention bugs, lice, mold, and rot. But, if you don’t give up, you’ll thrive and grow.”

“Life certainly is a gamble,” agreed the little cabbage, “but there’s one thing you haven’t made clear — when do I quit growing?”

“As in any other gamble,” said Mother Cabbage, “quit when you’re a head!”