We were on vacation in a remote rural area at a lumberjack festival. We brought our dogs with us. During the festival this big fat farmer in overalls comes up to us with his friend and points at our dogs tail and says "look at that dog, he has a tail like a piggy, I never seen a dog like that!" and just starts busting up laughing at him.
The dog, facing the other direction, turns completely around and looks the guy straight in the eye with the most hateful look.
The guy just immediately shuts up, shocked and just walked away. Then we laughed hysterically!