I know how to tie my shoes.
At least.. I thought I knew. Run a half-hitch, loop, the rabbit goes through, cinch down and you're done. As a child, my shoes always came undone; I quickly learned to double-knot.
Sometime in 2005 or 2006, I was working for a telecom company that was eventually acquired by Windstream, supporting the Network Operations Center (NOC). A friend of mine, my manager at the time, noticed the clunky double-knots on my business-casual shoes and laughed, "Are you two years old?"
I was somewhat incensed. Looking around online, I discovered Ian's Shoelace Site and quickly learned I did not know how to tie my shoes. I was tying granny knots.
Over the coming days, I reversed the direction of my starting knot and practiced. This was not unlearning how to ride a bicycle. Before long my muscle memory could create a proper shoelace knot.
I started running a few years later, and eventually landed on a pair of shoes with terrible laces. Every couple of miles I would have to re-tie one. Some small amount of shame, and the hassle of untying, kept me from revisiting the double-knot. Ian's knot site was still there, a decade later.
Today I use the Better Bow shoelace knot, almost exclusively.