A man sees a new machine at the drug store which has a sign "Any ailment diagnosed – only $1". His right arm has been sore for a week so he decides to give it a try. He follows the instructions by bringing in a small urine sample, dumping it in the machine, and inserting a dollar bill. Two minutes later he receives a slip on which is written "Tennis Elbow". Bullshit, he thinks, because he has never played tennis in his life. He decides to try it again the next day, and again it says "Tennis Elbow". Now he's pissed so he decides to really show the machine is bullshitting- He brings in a sample which is a mixture of urine from his wife, urine from his dog, and his own sperm. This time the diagnose slip says "Your dog is pregnant, your wife has the clap, and if you don't stop jacking off you'll never get rid of that Tennis Elbow".