In my 5 years as a CM member, I've gotten into some heated debates - sometimes those turned into fights.
The worst one ever (after an hour of back and forth, we were reduced to "f*ck you"s and the like) was about 3 years ago. It started out a debate about Gitmo and turned sour when she started bashing my DH because he was/is is the Navy and not the oh-so-superior Army. It was ridiculous, and I can still remember exactly what she said that infuriated me so much.
So...you? And if so, what was it about?