When you mount a tire, place it so the label or some other distinguishing mark is at the valve. Then, when you flat, find the tube puncture, go to the corresponding area of the tire to find what caused the flat.

I've done one walk of shame in my life. It was when I was out after dark, in the winter, when it was 38 degrees with a steady light rain, and I was about a half mile from home. My hands were already two blocks of ice. Any farther, I would have HTF-upped more and changed it. Walking the bike home was easier, even in cleats.

It was nice to change the tire in a heated, well lit basement.