This should be a good topic. Surely everyone remembers a teacher who did something so silly, outrageous, childish, or grossly inapproriate that it would stick in our minds for all time!
In 1984, I had a professor in English at El Camino College, Torrance, CA, who started to talk about student unrest during the Vietnam era. He said, “In 1968, at Berkeley [U. of Cal.], at the time of the herpes revo-… er, hippie revolution…” The class broke up laughing.
“If you drive an automobile, please drive carefully–because I walk in my sleep.”–Victor Borge