a Function of Middle Finger

In 1987, a kid who was still in elementary school asked his father about the function of his fingers.

Kid: 'Dad what is the use of fingers?'

Dad: 'Oh ... well, son, first little pinky finger to show that you're angry with your friend, keep ring finger for sweet to look nice, next (the father passes the middle finger and directly on the index finger) finger to point something, thumbs up when you want to say something nice or great using your thumb. '

Kid: 'Keep the middle finger for what?'

Dad: '(think for a moment) Son ... later if you are big, get married, i will tell you, patiently ...'

Time is finally over in 2012, the child is big and married. After a meal on the wedding day of the Son, He ask to his Father

Son: 'Daddy, do you remember telling me once what was middle finger function?'

Dad: 'Oh yeah ... like this (whispering) when you have sex with your wife and you're tired ... that's the function of middle finger.'

Son: 'You mean father?'

Dad: 'Ah ... damn you ... well that's your middle finger function on it.'

Son: 'How to do ???'

Dad: 'Here, have you thinking? ... your finger is lifted up push your forehead ... while saying:' I AM TIRED, STUPID !!!