This is a crazily awesome idea, and I'd be glad to have a chance to use it at some point. My main reason for commenting, however, is to point out that Watership Down is by Richard Adams, not Douglas Adams. Let me know when it's fixed, and I'll get rid of my nitpicking comment :). Go to Comment
Other improvisational weapons/tools:
Icicles are useful as daggers,
Bag Of Holding filled with copper pieces used by chucking the contents at foes, (by strolen)
sleeves make useful garrotes. Ya can't cut anyone's neck, but you sure can choke 'em!
Flaming Logs make great clubs, (any Barbarians out there?)
and Bee hives are very effective when thrown at a mob of enemies. :-)