A gentleman wanders around the campus of a college looking for the library. He approaches a student and asked, "Excuse me young man. Would you be good enough and tell me where the library is at?"
The student, in a very arrogant and belittling tone, replied, "I'm sorry, sir, but at this school, we are taught never to end a sentence with a preposition!"
The gentleman smiled, and in a very apologetic tone replied, "I beg your pardon. Please allow me to rephrase my question. Would you be good enough to tell me where the library is at, dummy?"