the fox, the goat and the well (look before you leap)

A fox fell into a well and was stuck there. A passing goat saw the fox asked if the water tasted good. "It's the best water you'll ever taste," said the fox, at which the goat promptly jumped into the well to drink. On realising he was stuck too, the goat agreed that the fox could climb up and over him out of the well and then help the goat out. The fox duly climbed up and over the goat to his freedom but left the goat stranded.