What's the most expensive thing you broke as a kid and what's the story behind it?
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 really, really liked disassembling stuff, and then not knowing how to reassemble. The most regrettable thing I disassembled was probably the Wii U. It would be nice to still have one, but I also really don't feel like buying one, so, yeah.