Bank Robbery

A man with a gun goes into a bank and demands their money.  Once he is given the money, he turns to a customer and asks, "Did you see me rob this bank?"  The man replied, "Yes sir, I did."  The robber then shot him in the temple, killing him instantly.  He then turned to a couple standing next to him and asked the man, "Did you see me rob this bank?"  The man replied, "No sir, I didn't, but my wife did!"