This is kind of dirty... But it the only one I actually know -_-
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So this old guy takes an old woman boating for a date. When they come to a fork in the river, the man asks, "Up or down?"
The old woman upon hearing this takes hi and her clothes off and gives him the best sex he's had in years.
He plans another boating trip the instant he gets a chance. They go boating again. They get to the same fork and he asks again, "Up or down?"
Again, the old woman takes both their clothes off and gives him wonderful sex.
He plans another boat trip. This time he dresses up nice and puts on cologne and other such things. He and the old woman go boating again. The get to the same fork. He prepares himself and asks, "Up or down?"
She replies, "Up."
He's a little confused but figures that maybe she just was getting tired of the same fork. They come to another one and he asks, "Up or down?"
She says, "Up?"
He's disappointed but decides to give it another chance. They come to another fork and he asks again, "Up or down?"
"Up," she replies.
This time he can't stand it and says, "What gives? The last two dates we had, whenever we came to a fork and I asked 'up or down' you gave me the best sex I've ever had. Why not this time?"
The old woman laughs and explains, "On our last to dates, my hearing aids were out. I thought that instead of 'up or down' you were saying 'f**k or drown'!"
*shrugs and walks away*