A man with a gun went into a bank and demanded their money. Once he was given the money, he turned to a customer and asked, '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.'