Some professors would tell you the greatest reward of the job is seeing students grow passionate about learning, but we all know the real reward is reading all the student reviews on ratemyprofessor and similar websites.
Whether they're thirsting after their teacher, or expressing a fiery hatred, students have a tendency to show off their creative writing abilities when reviewing their professors, and the results can be very honest and entertaining.
Not a professor, but there's this work of art one student posted on koofers:
[professor]'s eyebrows suit the man with a perfection rarely found in nature. They bristle from his forehead with the stubborn arrogance of a bougainvillea hedgerow, defying all attempts to question their inexorable will. Perched on his face like a pair of unusually hairy caterpillars engaged in a passionate kiss, they meet at an angle only slightly less obtuse than the man who wears them.