Joking?....

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 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, asshole?"

Q: How many schoolteachers does it take to change a light bulb?
A: None. Anything not completed during the lesson is added to the homework.

Q: How many students does it take to change a light bulb?

A1: None. Light bulb changing isn't in the course notes.

A2:"Is it worth any bonus marks?"