Ok here's one I've not seen. I'm crocheting the "High Roller" hat from Rita Weiss's "24-Hour Crochet Projects" and the gauge is supposed to be " first two rounds=2 1/4 inches." This means the diameter of the round--not the radius--doesn't it? I've gone from an N hook to a K and still aren't anywhere close. It's going to be pretty hard to crochet two strands of WW with anything much smaller.
Do I know what I'm doing? If I can't get any closer to the gauge, anyone have any suggestions on how many increases I should not do?