How about picking up a half knit sock, and starting a full DPN over from where you should, carrying the yarn all the way across your sock and not noticing it for a few rows. Not that big a deal to take care of, but sure leaves me feeling stupid every time it happens (yes, happens - plural :wall: )
Little aggrivation - doing a long tail CO for tons of stitches and running out of tail about 3 stitches before you're done... :grrr:
And, of course, I'm constantly having to double check that I'm not knitting with my tail... once I even knit with my tail on something long, I think it was a scarf or the front of a sweater, and then wondered what in the world was going on, and why was the bottom of my knitting pulled all the way up to the top :??
Or the time I knit some pomatomus socks, flipping the chart (because I'm left handed) but NOT flipping the decreases... it wasn't until I started in on a SECOND pair, that I noticed it :doh:
My hair is a little over hip length and I've often knit attached hair into my project... boy does that hurt! I've also spun attached hair into my yarn but I'm uber careful about that, I'm always afraid I'll get going fast and slurp my whole head onto the bobbin :rofl: