That was probably the most cherished mantra of my undergraduate studies. As well as something I'm getting more and more comfortable with as I grow. It's also probably a little overstated for this "mistake."
It's not really a mistake, but sorta-kinda a mistake.
My aim was to make the lovely Julia one of these in exchange for another new masthead. I went and bought the yarn. (Got a super deal which was bitter sweet considering the yarn shop was going out of business). Well, turns out I bought twice as much yarn as I needed. Then, I finished the knit... only to discover that my calculations were mistaken. The headband just barely fit around my head. I couldn't take the chance of sending it states away only to be too small for Julia's.
I just had to keep it for myself. So it ended up being a good thing I bought double the yarn. Now Julia and I can be headband twins.
Maybe that's all I really wanted in the first place?