Melanie R is looking for a career that will allow her to have sex appeal. She doesn't want to work hard, and values continued learning. She enjoys Arts and Writing, and is good at managing people.
Professor Sherman Klump (The Nutty Professor) Professors have found a way to never get a job: they just stay in school until they are dead. Klump, at least, is one of those professors who does a lot of research and work outside of his job, which amuses his entire family.
Chef (South Park) Cooks are great! They make the food that you can't make yourself. Chef proves you can be a sexy cook, and that you can say terrible, terrible things to children without repercussions.
Matt Hooper (Jaws) Marine biologists study underwater life, mostly in the oceans, but certainly not limited to them. Matt Hooper shows that marine biologists can beat up sharks as well as save them.
Mark Ritts (In Smog and Thunder) Historians research and compile the stories we learn in school. But The Historian is a little too good at morphing horrific events into fairy tales.
David Spritz (The Weather Man) Meteorologists figure out when it will rain, if that hurricane should be feared, or if it will just kill a bunch of Floridians, that kind of stuff. The weather man is one part meteorologist and one part broadcast journalist, much to the chagrin of David Spritz.