I have two favorites. The first one was purchased by a friend of mine at the Vatican gift shop. It has Pope Paul on one side and the Vatican on the other (in gold, of course). I understand the the Pope sometimes blesses everything in the gift shop, so I'm sticking to that story.
The other one I got at Club Night at last year's NHC from the Rock Hoppers Brew Club. It is a Kobalt brand 3/8 ratchet wrench with the gears taken out so the head of it is hollow. It's also a very pleasing weight and could be used as a weapon in a pinch.