Watching TCM this morning, there was a clip of Johnny Carson interviewing Jimmy Stewart. Jimmy Stewart told a joke I think many will like.
Man approaches a stop light and standing there is a guy with a dog at his side. The man asks the guy if his dog bites, to which the guy responds "no". When the man reaches down to pet the dog, the dog takes a plug out of the man's hand. The guy screams and yells at the man, "I thought you said your dog didn't bite". The man responded, "THAT IS NOT MY DOG'.
Of course not as funny in writing as Jimmy telling it live but just use your imagination and I believe you can get the idea.