The fairy says "I will give you what you most desire if you do someone else's job for a day."
The professor says "I'll be an elementary school teacher. What can be so hard about teaching a bunch of 6-year-olds how to read?" so he is teleported into a classroom. After a few minutes, all the kids' screaming gets to his nerves, so he throws all his supplies and gives up.
The C.E.O says "I'll be a waiter. All you do is carry food back and forth. This'll be a breeze" so he is teleported to a restaurant. After about an hour, all the annoying customers...