A student who has been taking an incredibly difficult ornithology class comes in for the final identification exam. He sees that the professor has set out the legs of different species of birds for them to identify. This is the last straw as far as the student is concerned. He proceeds to storm out of the classroom proclaiming, "That's it! I refuse to take this exam!" The professor, upon hearing this, calls out to the student as he is storming out the door, "Hey you! What is your name?" The outraged student pulls up his pant leg and replies, "See this leg? Figure it out!"
