When I was five I said to my Daddy, "What is a 'surprise' ?" So he said, "Pull your pants down and bend over." so I did. He said, "Okay,can you feel my thumb in your ass?" "Yes, Daddy." He then went, "Now,can you feel my other thumb in your ass?" "Yes, Daddy." That's when he wriggled both his hands in front of my face and said, "Surprise!"