J. D. Salinger, best known for his controversial novel The Catcher in the Rye (1951), is recognized by critics and readers alike as one of the most popular and influential authors of American fiction during the second half of the twentieth century.
My favorite quote from the novel:
"Anyway, I keep picturing all these little kids playing some game in this big field of rye and all. Thousands of little kids, and nobody's around - nobody big, I mean - except me. And I'm standing on the edge of some crazy cliff. What I have to do, I have to catch everybody if they start to go over the cliff - I mean if they're running and they don't look where they're going I have to come out from somewhere and catch them. That's all I do all day. I'd just be the catcher in the rye and all. I know it's crazy, but that's the only thing I'd really like to be." ~J.D. Salinger, The Catcher in the Rye, Chapter 22, spoken by the character Holden Caulfield
As I suppose that is sometimes the same as any parent/teacher does every day, if he/she is a good parent/teacher, of course.