I don't like Nazis as much as the next guy, but given a choice between beating up Nazis and getting laid, I think I'd prefer to get laid. Ya know, the whole "Make love not war" philosophy.
I'd bring my small box cutter, but I think a crowbar would be more effective. That, and I wouldn't wanna waste a perfectly good box cutter on street trash.
Does the soundproofness allow you to do stealth kills? Cuz otherwise, crowbar or not, you're probably gonna get overtaken by a room full of opponents, unless this is also happening in some sort of kung fu movie.
I believe many people carry with them a deeply buried desire to hurt people, but their morals keep them from doing it to just anyone. But they yearn for a chance to do it without moral repercussions.