OLD COUPLE

This old couple was sitting in their rocking chairs
on the back porch
when the old lady reached over
and knocked the old man out of his chair.

The old man got up,
sat back down in his chair and said:
"What was that for?"

The old lady said:
"That was for 50 years of bad sex."

A couple minutes later the old man reached over
and knocked the old lady out of her chair.

She got up and said:
"What was that for?"

"That's for knowing the difference."