[Nickigirl]

People often think that if you cut a worm in half, both ends will regrow and you'll have two worms. This is not true though. The tail end that doesn't contain the heart and brain will die.
So I'd agree with Sulis that this card could be about a disconnect of expectations.
It also makes me think of the phrase "cut your nose off to spite your face" - a self-destructive over-reaction to a problem.