Bang! An older tube with many patches blew the entire stem off the tube while the bike was parked. Replaced it with an equally-old tube, which blew the valve stem off the same way a few days later. New tubes in the same wheel have been fine.

Long, long ago, had a tube that kept getting punctures on the inner side of the tube. Eventually realized it must be burrs on the spoke holes, ground them all down, and that finally stopped it. That was probably before I knew about Velox rim tape.