I didn't read all the posts - I had this happen one time - and it was clearly my own fault. I simply tried to get too many miles out of the tire.

It happened about 15 years ago - so not sure about brand names - but think the tire was an Avocet. I'm sure the tube was butyl. A later inspection revealed almost all of the tread was gone - so when I rolled past the intersection with a gravel road - apparently a small, sharp stone went through the casing and tube. The casing was frayed where the tube exploded through it.

BTW - this was before the commonality of cell phones - but I was very fortunate to have a co-worker come by and take me back into town(about 6 miles) within 5 minutes.