Today I started assembling some stuff for a big race coming up.
I have an extra front wheel I thought I'd take along... you know, for a spare. On looking at it, I noticed the tire is mounted backwards. It's marked for the correct rotating direction, and that's not the way I had it. I don't believe that makes much difference, if any (especially not on dry pavement). But I thought I might as well turn it around. I went to all the trouble to remove and reinstall it. And then it occurred to me that all I had to do was turn the skewer around.
So today I proved that I'm not always the sharpest crayon in the box. (In my defense, I had just gotten done fiddling with a rear wheel. I'd checked that its tire was on the right way, so I was in that mindset.)