BAD SEX

An old man and his wife were sitting in their rocking chairs on
the front porch on their 50th wedding anniversary. The wife gets
up and slaps the old man so hard he almost falls out of his chair.

"Woman, what in the hell did you do that for?" he asked.

She replied "That's for giving me fifty years of bad sex!"

A few more minutes passed and eventually the old man gets up and
slaps his wife so hard she falls out of her chair.

"What the hell did you do that for?" she asked.

"That's for knowing the difference," replied the old man.