There's a man in a pub with a large dog.
Another man comes in and orders a pint and while he's waiting for it he says to the first man, "Mind if I pet your dog?"
To which the first man replies, "Not at all. My dog is as gentle as a lamb."
So the second man goes to pet the dog, which immediately barks angrily and bites him.
The second man said to the first, "You just said your dog was as gentle as a lamb!"
The first man replies, "Yes I did,