This old man and his wife were sitting on the porch rocking in their chairs. They'd been married for like 60 years. They just sat there rocking back and forth when all of a sudden Grandma reaches back and just slaps the hell out of Grandpa.
He rubbed his face. "Ma what ya do that for" he asked.
She looked at him and said "for being a sorry fuck for 60 years" They went back to rocking and in a couple of minutes Grandpa lays back and knocks the hell out of Grandma.
He knocks her out of her chair, off the porch and into the yard. She rubs her face and asks " Pa what you go and do that for"
He looked at her sternly "for knowing the difference" he answered.