I've heard Spiegel's joke and the sexual exhaustion before. The Onestone one is clever.

This is a pretty good one.

One day, in line at the company cafeteria, Jack says to Mike behind him, "My elbow hurts like hell. I guess I better see a doctor."

"Listen, you don't have to spend that kind of money, " Mike replies. "There's a diagnostic computer at the drugstore at the corner. Just give it a urine sample and the computer'll tell you what's wrong and what to do about it. It takes ten seconds and costs ten dollars...a hell of a lot cheaper than a doctor."

So Jack deposits a urine sample in a small jar and takes it to the drugstore. He deposits ten dollars, and the computer lights up and asks for the urine sample. He pours the sample into the slot and waits.

Ten seconds later, the computer ejects a printout: You have tennis elbow. Soak your arm in warm water and avoid heavy activity. It will improve in two weeks.

That evening while thinking how amazing this new technology was, Jack began wondering if the computer could be fooled. He mixed some tap water, a stool sample from his dog, urine samples from his wife and daughter, and masturbated into the mixture for good measure.

Jack hurries back to the drugstore, eager to check the results. He deposits ten dollars, pours in his concoction, and awaits the results.

The computer prints the following:

1. Your tap water is too hard. Get a water softener. 2. Your dog has ringworm. Bathe him with anti-fungal shampoo. 3. Your daughter has a cocaine habit. Get her into rehab. 4. Your wife is pregnant...twin girls. They aren't yours. Get a lawyer. 5. If you don't stop playing with yourself, your elbow will never get better.

edit: And this one.

One day Mrs. Jones went to have a talk with the minister at the local church. "Reverend," she said, "I have a problem, my husband keeps falling asleep during your sermons. It's very embarrassing. What should I do?"

"I have an idea," said the minister. "Take this hatpin with you. I will be able to tell when Mr. Jones is sleeping, and I will motion to you at specific times. When I motion, you give him a good poke in the leg."

In church the following Sunday, Mr. Jones dozed off. Noticing this, the preacher put his plan to work. "And who made the ultimate sacrifice for you?" he said, nodding to Mrs. Jones.

"Jesus!", Jones cried as his wife jabbed him the leg with the hatpin.

"Yes, you are right, Mr. Jones," said the minister. Soon, Mr. Jones nodded off again. Again, the minister noticed. "Who is your redeemer?" he asked the congregation, motioning towards Mrs. Jones.

"God!" Mr. Jones cried out as he was stuck again with the hatpin.

"Right again," said the minister, smiling. Before long, Mr. Jones again winked off. However, this time the minister did not notice. As he picked up the tempo of his sermon, he made a few motions that Mrs. Jones mistook as signals to bayonet her husband with the hatpin again.

The minister asked, "And what did Eve say to Adam after she bore him his 99th son?"

Mrs. Jones poked her husband, who yelled, "You stick that goddamned thing in me one more time and I'll break it in half and shove it up your ass!"

"Amen," replied the congregation.