I'll second your grrrrrr and add a few rrrrrrrrr's to it!!
I had been doing great all week. Keeping my calories under 1600 and exercising for 60 to 90 minutes at the gym. The scales were looking good and I was exited that I would lose. Then yesterday morning, day of my official weigh-in, the scales were up. I had foolishly ate homemade stir-fry the night before and think I was retaining water. So, I was up a pound last night at my weigh-in and of course am 2 pounds down this morning. Sure, it's not a big deal in the scheme of things, but dang it makes me mad to see that red ink announcing a one pound gain in my weight book when I know it was a bogus gain. Ahhhh well onto next week.