What quick and dirty tool/method should I use for cutting scrap drywall? [solved]
I have a pile of drywall scrap that's been sitting in my garage for a few years after a remodel, "just in case". My buddy came up with the idea of turning it into "karate boards" for our kids to destroy. Scrap pieces start at half sheet (4x4) and go down.
I'm also on the lookout for an excuse to buy something new. (Honey, it's for the kids!) At this point my only idea is to use the circular saw and toss the blade afterwards.
A craft knife or box cutter will do the job very quickly and cheaply. You only need to score the front side of the drywall and then it should snap cleanly enough along the score line.
If you already have a Dremel or Roto-Zip, you can get drywall bits for them that will make short work of any drywall.
Niall's right with the craft knife -- just score, snap, and cut the paper on the other side.
The rotozip and similar work fine, when it's just quick a dirty, unless it's really intricate cuts, I stick with a good old drywall saw. You can get cheap ones for $3-5.
There is always a drywall saw. It can be messy (not as clean as a knife) but it works fast. 
If you're really on the lookout to buy something new, a sawzall would make extremely quick work of this task. It's like using a sledgehammer to kill a fly, but they're really handy in other areas, and you can pick one up for less than $100.
The rotozip suggestion is also a good one.
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