I got into knitting again a few months ago (after not picking up my needles for 20+ years) and have made a couple of relatively successful things: scarves, blankets, etc.
Anyway, I just finished my first in-the-round project - a hat - and I somehow managed to turn it inside out!

I mean I swapped the wrong/right sides.I think it was when I swapped from circular needles to dpns.
Sorry for bad quality pics