Over twenty years ago before I had a cell phone I was riding out in the country. I was kind of in the middle of nowhere and I had a flat. No problem I thought since I had everything that I should need. For some reason the little nut on the presta valve was on there so tight I could not get it off! I know that it always seemed loose so one time I really cranked it on there. That day I regretted it greatly. I walked for quite awhile but I was so far from home I was looking for a friendly farm house. A truck pulled up and asked if I needed help. I asked if he had some pliers but he didn't and offered me a ride. He drove me and my bike about 15 miles home. We have been great friends since. I no longer have those little nuts on my bike anymore.