Man, I consider myself blessed.
I've yet to have a flat on one of my bikes but was with a buddy, who I built a bike for, and he had one about two miles from the house. As luck would have it he ran over a 1/16" cotter pin that went through the rear tire sidewall. Weird, but it let the air out and he had to walk the bike back to my house. I walked my bike with him. No fun.
I don't even carry a patch kit or spare tube when I ride. Maybe I should reconsider.
Tom
oh well, i'm going to look at it as an "opportunity" to get rid of that cheap walmart tire.
i didn't like it anyway.