A few years ago I discovered that I had spent my entire life tying my shoes incorrectly, with a Granny Knot instead of the stable Square Knot (the knots are very similar). My shoes would always come untied and I frequently double knotted them. Now a single knot is always sufficient.
This! I've never had a good explanation, but being left handed I was making a granny knot about 80% of the time. I never figured it out consciously, but it eventually nearly stopped. Just the rare one.
