Luck.

A man entered a bank with a gun in his hand and asked for 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!'  Moral - When Opportunity knocks.... MAKE USE OF IT !