Two elderly women were out driving in a large car. Both could barely see over the dashboard. Cruising along, they came to an intersection. The stoplight was red, but they just went on through. The woman in the passenger seat thought, "I must be losing my mind. I swear we just went through a red light."
A few minutes later, they came to another intersection, and the light was red again. Again, they went right through. This time, the woman in the passenger seat was almost sure that the light had been red but was really concerned that she was mistaken. She was getting nervous and decided to pay very close attention to the next intersection to see what was going on.
At the next intersection, sure enough, the light was definitely red, and yet they went right through. She turned to the woman driving and said, "Mildred! Did you know we just ran through three red lights in a row! You could have killed us!"
Mildred turned to her and said, "Oh, am I driving?"