Woman in white in foreground and a man slightly behind walking with a sign for John 's Pizza and Gyro in the background .
Chances are about even that a man and a woman walk down a crowded city street .
Chances are about even that a man and a woman walk down a crowded city street .
It is impossible that a man and a woman walk down a crowded city street .
A man and a woman walk down a crowded city street .