The last few pairs of socks I've knit have been toe-up, which I really like for some reason. And they've all had a gusset-and-flap heel, which I think is the easiest heel out there.
I have messed up the heel on the last five socks (not pairs, but I'm heading toward 3 full pairs). I knit one pair that was finally successful, another where I am on sock #2, just having recovered from tinking and reknitting the heel, and another where I am on sock #1, just did the heel turn at knitting tonight...and it is beautifully executed, but not centered.
Sigh. None of these mistakes have even been the same thing.
I think it's time for bed.