Plane Truth
Two travellers, seeking respite from the searing heat of the midday sun, took shelter under a leafy tree.
They soon felt cool and refreshed.
“What sort of tree is this? Does it produce edible fruits?” asked one of the men to the other.
“It’s a plane tree,” said his companion. “Don’t waste your time looking for fruits. It produces neither edible fruits nor good wood. It’s one of the most useless trees around.”
“How can you say that when you’re enjoying my shade at this very moment?” snapped the tree.

Moral: Often, a person’s worst critics are those who have benefited the most from him.