A very old couple that have been married forever are sitting on their porch one night. Suddenly, the old woman reaches over and smacks her husband, knocking him off the porch and into the bushes.

He crawls back up and asks, "What was that for?"

She says, "For having a little pecker."

He sits there quietly a moment, then smacks her, sending her off the other side of the porch and into the bushes. She crawls back and asks, "What was that for?"

He replies, "For knowing there was more than one size."