I'm going to call it a case of hubris. I was knitting my bulky sweater and going through about 1½ balls of yarn a day and I'll admit it, I was thinking - you know, I might be able to knit this sweater in a week!! When last I showed this sweater (on 1/28) it looked like this:
Cue trombone sounds: "Wha-wha-wha-waaaaaaaaaaaah!"
I took the whole thing apart.
I had swatched, washed and blocked and measured my swatch, but then on a larger scale, my gauge grew and the sweater was just too big. So I frogged it and started again the evening of the 2nd in the next size down.
The good news is, it fits great now, and I'm right back to where I left off the first time yarn usage-wise and a little further ahead pattern-wise.