What does your tire look like?
I'd agree the most likely cause is trapping a fold of inner tube under the tire bead. If your tire doesn't look damaged, that's almost surely it.
If your tire has circular marks just adjacent to the rim, check your brake pad alignment. If your brake pad touches your tire it will wear through and eventually blow out.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.