Mine was our CRT TV. I would rapidly push the power button on and off because I thought the picture coming and going looked cool but eventually it fell inside of the TV. I think I later stuck a magnet on the TV.
Not looking for Reddit answers like “My parent’s marriage”
I broke the screen on my laptop, but that was only after having it for like five or six years. And even after that, I still used it as a closet web server for years after that with SSH.
Edit: I think I was about 16 when that happened.