I'll get this going, since I was posting in the other forum too.

I've had two clinchers explode.

One was due to a pinch flat. I rushed to install the tube and as I pumped it up in the garage, it exploded. Scared the crap out of my dog, and me. This was purely my fault, as I usually check to make sure that the tube is not under the tire bead.

The second was much more strange. I was riding along when all of a sudden, bam. There was an explosion in the back wheel that blew a hole in the sidewall of my tire. It looked like something had been shot out of tire. Had there been holes on both side, I would have believed I had been shot - I was riding past an outdoor shooting range - but the hole was only on one side and the hole in the tire was clearly angled outward. I have no idea what caused it. The tube had a hole in it - where a hole piece of rubber was missing - not a tear or poked hole. The tire still had several hundred miles left on it, and the tube was not particularly new, though not old either.

As for specifics: Kinlin 27mm rim, Conti GP4000 tire. QBP tube.

On a different note, I was out mountain biking when a guy's tire tore at the bead and the tube popped out. It was pretty funny.