This is possibly the coolest piece of furniture I have ever seen:
(It would probably be most effective if, when confronting your would-be assailant with this, you also screamed "This Is SPARTA!!!!!")

The furniture needs to come in pairs in case of a late night dispute. http://www.cathetel.com/whatsgood.htm

Also good at meetings: http://www.cathetel.com/whatsgood.htm