A blind man was waiting to cross the road when his guide dog cocked its leg and urinated on him.
Calmly, the blind man reached into his pocket and took out a biscuit for the dog. A passerby who had seen everything remarked, "That's extremely tolerant of you, especially after what he just did."
"Not really," came the reply. "I'm just finding out where his mouth is, so I can kick him in the nuts."