An old couple are sitting on the porch in their rocking chairs one evening. The old man's reading the newspaper, the old woman doing her knitting. The sun is setting under a vivid red sky, the dog is snoozing on the step chasing rabbits in his dreams, all is peaceful and right with the world.
The old woman picks up a magazine, rolls it up and BAM!!! Smacks the old boy across the head. The newspaper goes flying, he tumbles out of his rocking chair and lands with a thump on the floor, slightly dazed.
He picks himself up, gathers up his newspaper and calms the dog before sitting back down.
"What the hell was that for?" he asks
"40 years of crap sex." she says.
"Oh"
A little while later, he rolls up his newspaper and BAM!!! Smacks the old woman across the head. Her knitting goes flying, and she lands on the floor with a bump.
She gets up, picks up her knitting, rubs her hip and sits back down.
"What was that for?" she asks
"That's for knowing the difference!"