>It might just be me, but I'm wondering how a knife blade could be an attachment on a jackknife. Isn't it the essential part of the jackknife?

I've treated this Poll as if it was a Swiss Army Knife (although not all multi-function knives are "the real deal" they tend to be referred to as such, much like vacuum cleaners being referred to as hoovers), and usually those knives have 2 blades - a little one and a big one. So if you decide that the little blade is an "attachment" and the big one defines "jackknifiness" (or vice versa), then everything should be okay.

Personally I think its disturbing that the "odd metal thing with no discernable purpose except to spring out and plunge itself into your flesh at inopportune moments" attachment was not in the running for votes.

Bo"AAAAAARGH MY LEG!!!!"urne