What curse word, slur, or otherwise offensive term presses your buttons the worst? The one word you cringe at every time someone uses it in conversation or as an insult? For me, I think it is definitely "retarded" and "retard." I've heard people with mental disabilities talk about how much that word hurts them, and to hear people throw it around as an insult kills me. Calling things "gay" is a close second, but in that case it depends a little more on the context. So what is it for you guys?