I've had one blow up in Poland. Ul. Winklera, Poznan. I'll never forget that. My s.o. was about to use the (common for three apartments) bath and the thing blasted its outer cover clear across the room. She ran into the hallway totally forgetting her state of dress or lack thereof. The neighbours, alerted by the explosion that something was up, all piled into the hallway and sure appreciated the view.

Fortunately she was only scared but otherwise ok. Quite the bang, I've had a healthy respect for old Junckers products that have gas lines fed into them since.