A blind man is standing at the corner with his seeing eye dog waiting
   to cross the street,
   when his pooch lifts his leg and pisses down the side of his nice
   herringbone tweed
   trousers. The guy immediately reaches into his jacket pocket and
   retrieves a doggie biscuit
   which he starts to offer to Fido.
   A businessman, who is also waiting to cross the street, observes this
   happening and
   interrupts, "Excuse me buddy, but are you aware of the fact that your
   dog just pissed all
   down the leg of your pants?"
   "Yes, I'm trying to break him of this dreadful habit", replies the
   blind man.
   "Well, it's none of my business," says the onlooker, "but you're not
   going to teach him
   much by rewarding him with a biscuit!"
   To which the blind fellow chuckles, "Oh I'm not rewarding him. I'm
   just trying to find his
   head so I can kick his ass!"