A cowboy was riding his horse across his pasture. A snake spooked his horse and bucked the cowboy off. The cowboy cursed at the snake and yelled "Don't bite me!" 

The snake said "NO, I'm a genie snake, I can give you three wishes. What would you like me to grant you?"

 The cowboy thought for a minute...then said "A million dollars in the bank."

 The snake said, "Granted, next."

 Again the cowboy thought. Then said "The most beautiful wife in the world."

 The snake said, "Granted, next."

 Then with a great big smile on his face he said "I want to be hung like MY horse."

 The snake said "Granted" and slithered off.

 The cowboy got on his horse and rode home as fast as the horse would take him.

 He ran into the house and into his bedroom. There stretched across his bed in a sexy negligee was the most beautiful woman in the world.

 So he picked up the phone called the bank and asked for his balance. The bank told him he had one million and forty nine dollars. He rushed into the bathroom.

 Unzipped his pants and let out the most blood curdling cry.

 "Dammit, I forgot I was riding OLD NELLIE!"