It seems there was a Dean at this college upset over the budget. An assistant came in to find out what was happening.
Dean: Why can't the philosophy department be more like the professors in the mathematics department.
Assistant: What do you mean?
Dean: All the math professors ask for are paper to write on, pencils to write with, and erasers to use when they make mistakes.
Assistant: So what's the problem?
Dean: The professors in the philosophy department are just as expensive and they don't even ask for erasers.