Last time I was sewing I was so enthusiastic to get things done that I sewed up the side seams of my nightdress. So, today, when I was able to sew for a short time, I realised I'd been intending to use the burrito method of sewing and turning the armholes ... but couldn't because I'd already sewn the side seams.
Took me a bit more fiddling to reach up between the lining and the outer fabric and sew them "inside out" IYKWIM. It worked OK but a bit of forward planning would have saved me a lot of time and messing about.