Some ~12 years ago, I was debugging POS integration with a receipt printer and accidentally sent garbage postscript to the receipt printer, which printed it out verbatim.
Stopping it was impossible. Power cycling that printer had absolutely no effect. It wrote the unfinished print job to some kind of persistent memory, and by god it was going to finish it.
It went through something like 2 1/2 rolls of receipt paper (yes it dutifully awaited the new rolls and then just continued) and due to the thermal printing process it smelled very odd, and I had quite a few metres of raw Postscript afterwards to decorate a wall with.
Stopping it was impossible. Power cycling that printer had absolutely no effect. It wrote the unfinished print job to some kind of persistent memory, and by god it was going to finish it.
It went through something like 2 1/2 rolls of receipt paper (yes it dutifully awaited the new rolls and then just continued) and due to the thermal printing process it smelled very odd, and I had quite a few metres of raw Postscript afterwards to decorate a wall with.