I was feeling good about wrapping up unfinished projects, so I picked up a doily I've been working on for years and started tatting on it again. I started the final row, still feeling good. Then I realized I'd misread the pattern and missed a ring.
I had to chop off the final row. It's a good thing I managed to take it off without nicking the previous row. Still, I feel like I should do some sort of tatting penance for making such a silly mistake.