It seems like there is always a left mitt.
It gets left because you're busy. It gets left when you're in a hurry. It gets left in the wrong place. It gets left for something newer or "better".
Today I finished my left mitt. An actual left mitt... the right had been done for nearly two weeks. I knit a pair of Sherwood Mitts by Ashley Knowlton (along with the Easy Lace Scarf) for Newfangleddad's mom as a Christmas gift.
I don't plan to leave any mitts - left or right.