Today, I learned how to knit left-handed.
I've been teaching knitting lessons for a few months, now. I've had no fewer than 3 people ask for directions on how to knit left-handed (not holding yarn in left hand, which is knitting continental, but actually knitting from left to right instead of right to left) and now, finally, I've given in and learned to do it myself. I'm sick of being stumped by questions. And though I'm still figuring out a few of the kinks, I did it all by myself.
How will this help beyond helping other people to knit? If I can get proficient at it, I'll be able to replace purling entirely with simply knitting back the other direction. Pretty cool, if I do say so!