The first time Marvin "The Beastman" Eastman (13-6-1) stepped into the Octagon back in 2003 at UFC 43, Vitor Belfort (14-8) opened up the Suez Canal above his right eye with a box cutter, er, ferocious knee.
It's probably the nastiest cut I've ever seen in the UFC (Yves Edwards, Gideon Ray and Josh Neer are up there, too).
Even legendary cutman Jacob "Stitch" Duran — seen in the background — was rendered useless with this gash.
Eastman wound up losing the bout, but on the bright side, chicks dig scars.