As the crowded elevator descended, Mrs. Simpson became too furious with her husband, who was delighted to be pressed against a gorgeous blonde. As the elevator stopped at the main floor, the blonde suddenly whirled, slapped Mr. Simpson, and said, "That will teach you to pinch!" Bewildered, Mr. Simpson was halfway to the parking lot with his wife when he choked, "I...I...didn't pinch that girl." "Of course you didn't" said his wife, consolingly. "I did."
Cook a man a fish and you feed him for a day, but teach a man to fish and you get rid of him for the whole weekend.
A physics student ask his teacher: "Can you point me to someone who can teach me a way in which quantum mechanics can be united with general relativity?" The teacher answers: "Let me see if I can pull some strings for you."