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 and asked the man, 'Did you see me rob this bank?'
The man replied, 'No sir, I didn't...
But my wife did!!!