[QUOTE=Rider51;19683370]I don't know how odd this is, but I'm going to say Spin Skins. Anyone remember them? They were this thin kevlar liner you put inside your tube, like Mr. Tuffy or Slime, only smaller. The issue was, if you didn't get it just perfect, it would cause pinch flats. Or, if you did line it up right, and it slid a little over time, for whatever the reason (hard cornering), you'd pinch flat. Refusing to ditch them and admitting I wasted money, I spent an inordinate effort making sure it was perfectly aligned. Only to find out a month later I flatted again, because it was shredding apart within the tire.

As far as cars go, I remember seeing my local mechanic pulling a full 1/2 open ended wrench out of a tire. How on earth the guy who ran over it hit it just right to where it was able to puncture completely through the tire I'll never know. But it sure was a sight to see.

Looked kind of like this:


My wife once drove over a door hinge that managed to completely go through the tire. I had no idea that was even possible, it seems like the surface area would be too great to go through the steel belting. But it happened, huge gash in the tire, wish I had taken a picture to prove it.