Joe was taking a course in ornithology, the study of birds. The night before the biggest test of the semester, Joe spent all night studying. He had the textbook nearly memorized. He new his class notes backward and foreward. Joe was ready.

The morning of the test, Joe entered the auditorium and took a seat in the front row. On a table in front of the class was a row of ten stuffed birds. Each bird had a sack covering its body, and only the legs were showing. When the class started, the professor announced that the students were to identify each bird by looking at its legs and give its common name, species, habitat, mating habits, etc.

Joe looked at all the birds' legs. They all looked the same to him. He started to get angry. He had stayed up all night studying for this test and now he had to identify birds by their LEGS? The more he thought about the situation, the angrier he got.

Finally he reached his boiling point. He stood up, marched up to the professor's desk, crumpled up his exam paper and threw it on the desk. "What a ridiculous test!" he told the professor. "How could anyone the difference between these birds by looking at their legs? This exam is the biggest rip-off I've ever seen!"

With that, Joe turned and stormed toward the exit. The professor was a bit shocked, and it took him a moment to regain his composure. Then, just as Joe was about to walk out the door, the professor shouted, "Wait a minute, young man, what's your name?"

Joe turned around, pulled up his pants leg and hollered, "You tell me professor! You tell me!"