Bill was having a drink with his friend when he complained "My elbow really hurts! I guess I should see the Doctor"
"His friend said "It takes forever to see the Doctor, then he gives you an expensive prescription for expensive medication and an expensive visit to the physio, you should try that new computer at the drug store.
Take a sample of your urine, the computer will diagnose your illness and tell you what to do inside a minute, it only costs $10.
Bill decide to give it a go, after all it only cost $10. So he took a sample in, poured it into the machine and put his $10 in. Within a minute a slip of paper came out of the printer " DIAGNOSIS:- You have Tennis elbow, soak your arm in warm water twice a day for 15 minutes. Avoid heavy lifting. It will be better within 2 weeks.
After 5 days, Bills arm was feeling much better and he thought how amazing this computer was, so he decided to test it out.
He got some tap water, a stool sample from his dog, urine samples from his daughter & his wife and to top it off he masturbated into the concotion.
He went down to the drug store and poured the mixture in and paid his $10, within a minute the paper slip came out again.
It read "Your tap water is too hard, get a water softener. Your dog has worms, get him some vitamins. Your daughter is using cocaine, put her in a rehab clinic. Your wife is pregnant with twin girls, they aren't yours, get yourself a good lawyer. Finally, if you don't stop jerking off, your tennis elbow will never get better."
Subject: Super Computer 
