Blind man (no, not THAT old one)
A blind man was walking down the street with his seeing eye dog one day. They came to a busy intersection, and the dog, ignoring the high volume of traffic zooming by on the street, led the blind man right out into the thick of traffic. This was followed by the screech of tires and horns blaring as panicked drivers try desperately not to run the pair down.
The blind man and the dog finally reached the safety of the sidewalk on the other side of the street, and the blind man pulled a cookie out of his coat pocket which he offered to the dog.
A passerby, having observed the near fatal incident, couldn't control his amazement and said to the blind man, "Why on earth are you rewarding your dog with a cookie? He nearly got you killed!" The blind man turned partially in his direction and replied, "To find out where his head is, so I can kick his ar$e."