As a kid I stressed our Olivetti divisumma 24 ( https://www.ithistory.org/sites/default/files/hardware/Olive... ) with a million times a million. It entered a perpetual mechanical cycle that even unplugging it could not break. Finally Dad had to attack its innards and tug and twiddle until he pulled out a spring loaded gear and it caught a cog on the next go-round. It lifted its digit arms and printed out a 'partial answer' that was a series of random numbers as wide as the whole mechanism.

He said "please don't do that again." I moved on to torture computers.