 I'm going to make sure this time it won't go flat again. So he starts pumping it. Doesn't pull out the air gauge, just keeps pumping up that tire a bit more and a bit more. And now it's bigger. It's nice and firm. Won't go flat now. And the system, the tube inside that bike tire, it can handle a good amount of air. But Dave was just pumping up that tire over and over more and more instead of dealing with the real issue of why the tire was going flat. So he goes back out on that big, firm, pumped-up tire and is racing down the street to catch up with his friends and hits that first bump.