A traveling salesman asked a farmer to spend the night. The farmer agreed, but told him he would have to sleep in the barn. The farmer, being a nice guy and knowing how horny traveling salesmen get told the man, "Look son, see that wall? It's got three holes in it. You can screw the first two but don't mess around with that third hole. Got it?" The salesman thanked him and bedded down on a pile of hay. About midnight he got real horny and decided to take a poke at the first hole. It was good but not really satisfying so he took a poke at the second hole. It was even better but he still wasn't satisfied so he thought about the third hole and reasoned to himself, "If that first hole was pretty good and the second hole was even better, I'll bet that third hole will really do the trick!" The next morning the farmer noticed the salesman was still sleeping so he went about his chores and late in the afternoon he finally saw the salesman wake up. "Damn, son! You been sleeping a long time! What happened?" "Well," the salesman replied. "I should have listened to you. I got horny last night and tried that first hole and it was pretty fair but not really satisfying so I tried the second hole. It was good but didn't do the job so I took on that third hole. Say, what's behind them holes anyway?" "Son, that first hole is my sheep, Dolly. The second hole is my mare, Sally, and that third hole is my milking machine and that thing don't quit till it gets a quart!"