I almost got knocked the fuck out!

A few minutes ago I was turning the blind corner of our hallway and almost ran into my co-worker Eric, who just happens to be a martial arts bad ass and knows a dozen ways to kill you with his pinky toe. Anyway, I startled him and he instinctively got in some kind of weird stance and looked like he was gonna take my head off. He laughed and said, "man, I didn't know who you were" and laughed. After checking to see if my pants were still dry, i laughed too.