You read that right: flat tires. It's not about any particular flats which me Uncle John who we call Zeke had in his lifetime, although he had his share. More than his share, he might argue. But this is about potential flats.
Any sharp object can cause a flat: a screw, a nail, even a small bolt under the right speed and angle can imbed itself into a tread. Ask a math nerd. However it happens, a few miles down the road and you're on the shoulder fighting to break lugs nuts loose, lamenting your poor luck. You didn't, you couldn't even see when it happened. But you would find the dread nail and curse it.
Again, this isn't about real life flats but possible ones. I can't tell you how many times we'd be walking to and from the old barn to one of our satellite garages and Zeke's eyes would zero in on an object laying in the alley as though he were Iron Man seeing with the ultra sensitive sight of his metal suit. He pick up that vile nail and hold it out for you to see, right in front of your eyeballs. "That's a flat!" he would proclaim with scorn.
He was, of course, right. For all the actual flats we dealt with, it was best to get all the potential ones out of the way.