A man in a restaurant orders the house special. An old waiter brings out the order beginning with some hot soup. The customer notices the waiter has his thumb in the soup.
Feeling sorry for the old man he doesn't mention it, and leaves the soup uneaten. When he brings the main course his thumb is in the potatoes. Then in the coffee.
Finally, he angrily asks the waiter why he has his thumb in all his hot food.
The waiter says, "I have arthritis and the doctor told me to keep it in something warm."
The customer says, "why don't you stick it up your ass!" And the waiter says , "I do that in the kitchen!"