So this elderly gentleman gets up in the middle of the night for his usual bathroom visit, but he's having trouble getting started. He's standing there in the dark, and he starts urging his reluctant member to cooperate:

"Come on, little fella, let's get going here. I'm sleepy and want to go back to sleep; you must be sleepy, too --" at which point his wife calls out from the bedroom, "Who are you talking to in there?"

After a pause, the old guy answers sadly, "You wouldn't remember him."