Bart and Principal Skinner become friends when Bart accidentally gets his nemesis fired.
Added:

The Simpsons Season 5 Episode 19 Quotes

Sir, I got carsick in your office.

Ralph

Principal Skinner: (Over phone) I know Weinstein's parents were upset Superintendent, but I was sure it was a phony holiday. I mean, it sounds so made-up: Yom kip-pur!