A stranger enters a store and spots a sign: DANGER! BEWARE OF DOG! Inside, he sees a harmless old hound asleep on the floor.
“Is that the dog we’re supposed to be aware of?” he asks the owner.
“That’s him,” comes the reply.
“He doesn’t look at all dangerous to me. Why would you post that sign?”
“Before I posted that sign, people kept tripping over him.”