This Idiot I Work With

This idiot I work with is like a friggin UFC baromter. Everytime one is coming up, he devolves into a lesser form of human for a week. He talks to anyone who will listen about the fights (whether or not they're interested) and what he'd do if he was fighting and whatever. I watch the stuff with my boyfriend sometimes, but there's no way that it's a sign of sane mental health to be running around the office like he does oooh-ing and aaah-ing about guys fighting.