I thought for a second that it was some kind of torture thing for bad Combine soldiers.
Of course, I just wanted to blast everything in the place, cause I was pretty pissed at Our Benefactors by that point. Bastards won't let Alyx and me have sex.
That zombie with the five or six poison headcrabs on him... man. I'm gonna see that bastard in my dreams. Thanks, Valve. :(
That and the fact that he can take serious amounts of punishment.