I'd probably grab a traditional weapon in my living room. Like a gun or sword. The ammo is locked up though, and any already loaded gun are also locked up, so I'd probably grab a sword. Last week I finally got a Bujinkan Oniyuri, at a nice reduced price too, so I'd probably go for that. Haven't had the chance to check it out yet, but it's supposed to be a pretty nice blade.
Now, if my living room didn't have things like that, I'd probably grab a chair, since my living room is actually pretty sparse. Or run to kitchen and grab a knife.