Be Careful Where you Bite

Two snakes were out taking a stroll when one turned to the other and
asked, "Are we poisonous?"

"Why yes we are," said the second.

Again the first snake asked, "Are you sure we're poisonous?"

"Yes we are very poisonous."

Again the snake asked, "Are we really, really poisonous?"

"Yes we are really, really poisonous. In fact we're the most
poisonous snakes in the world. Why do you ask?"

"I just bit my lip!"