Little Johnny was sitting in his bedroom feeling really 
depressed. In walked his dad and asked, "What's up son?"
Johnny replied, "Dad, I really need to get laid. I'm really 
horny!"
With that the father pulled $100 from his wallet and said, 
"Here you go son. Go into town tonight and have a good time."
"Great!" said the boy, and off he went.
The next day Little Johnny is in his room feeling good. 
In walks the old man again and asks, "How did you do last 
night?"
Little Johnny answers, "Hey dad, I got laid last night and 
I've still got the $100."
"Wow son, how did you manage that?" his father asked with 
interest.
"Well," said the boy, "I went into town like you told me 
and I met grandma there and told her what I was up to and 
she took me to her place and fixed me up."
The fathers jaw dropped and he shouted, "What! You screwed 
my mother!"
Little Johnny said, "Why not dad? You screw mine!"