My first grade teacher didn't do field trips like Susan Sto Height from Thief of Time, but she was a lot of fun. I would quite enjoy being in Susan's class.
I also read that Stephen King used to teach High School english for several years. (he did construction work for the school district during the summer becasue the pay was so lousy for the teachers. Re tiling the girls shower led to the inspiration for Carrie.)
Joanne Rowlilng used to teach ESL in Portugal.
Which writers do you think would make a fun teacher, which class would they teach, and which level do you think they would teach?
For example, George McDonald Frasier would be a great community college teacher of History and Politics. (I don't know what you call community colleges in Britan, but Tom Sharpe's Wilt taught at something similar.)
Of course, you can also share horror stories of folks who really didn't belong in the teaching profession. Or shock of those who spent a lot of time there. Like general Lee spent several years as Comendant of West Point and president of Washington college. (now Washington and Lee university) General Sherman was president of Luisiana State.

