Two men sit with a German Shepherd in a bar.

[Harry]

Two men sit with a German Shepherd
in a bar. Someone comes in, looks under the German Shepherd's tail and goes out again. If a second person comes in, he also looks under the German Shepherd's tail and goes out again. A third person comes in and looks under the German Shepherd's tail and wants to go out again. Then the dog owner says: "You're the third person to look under my dog's tail, what's the point?" - "There's someone outside who says there's a German Shepherd sitting there with two assholes in it."