Originally Posted by LupusUmbrus
For small amounts of grain, I've heard throwing the grain in a big ziplock bag and then using a rolling pin to crush the grains works in a pinch. Probably would take a little while to get a decent amount crushed though.
My experience has been that this method is superior to a blender or food processor, both of which grind some grains to dust before they've broken other grains at all.
If you use a really large (1/2 gallon?) bag, it's even fairly quick for the amount of grains one uses in extract + specialty grains recipes. The only real problem is that thos big bags aren't cheap, and this process will wreck the bag (lots of little holes).