When I was young, I'd inherited my cousin's Crystal game right.
So he'd already had a save file on it so of course wanting ti to be my own journey on there instead, I'd restarted the game. When I was playing and it was time to save, when the confirmation of "Are you sure to overwrite last save state?" and I was freaking out cause I thought atm it would erase all of the gameplay I had done so I didn't save, but I knew if I'd turned it off all my gameplay would be gone.
So, I'd never turned that gameboy off, AT ALL.
I remember vividly I was about to challenge the Elite Four and I was called to lunch, when I'd put my gameboy down I'd accidentally touched the cartilage and it popped out (but I didn't notice.) When I'd came back from lunch and was ready to take on the Elite Four, it was frozen right and I'd started freaking out and I had no choice but to turn off the gameboy and start from the very beginning of my game.
Very traumatic and that's why I save my game all the time right before I do something lol.