I pushed the largest TV off a window ledge at an electricals store because I wanted to watch the TV, so I put myself between the TV and the window. Obviously I’d never lifted a TV before and had no idea about their centre of balance. Because it wasn’t tied down properly the store was reprimanded and my poor mother didn’t have to fork out. I think I was around 4 or 5

I suspect i might be the winner here. My friend had an alley behind his house along with a nice strip of open land near a busy road. Eventually a strip mall was built and then another large commercial building started to go up. Being basically behind my friends house we walked over to this new building on weekend to check out the construction site.

The building was being built with cement block and had lots of scaffolding and yet-unused block scattered around. I found a pipe-bender - a very heavy tool made out of high quality steel - and found you could just tap on of these cement blocks and it would shatter to pieces. I was fascinated, as were my friends. I have no idea how many cement blocks we destroyed over the next couple of days, but it was a huge number. Then we decided to see if we could go through a wall with the pipe bender… we could indeed, making a hole in the side of the building we could walk through. Looking around we eventually realized what we’d done was awful… we had decimated this construction site. We finally slinked away and come Monday when the crew returned, police were called and neighbors interrogated but thankfully with privacy fences all around, none of the neighbors saw anything. 11 and 12 yr olds are stupid.

An electric keyboard imported from outside of soviet block. I was too young and stupid to understand the power brick and conected it directly to mains. A shower of sparks tought me an important lesson about electricity and voltage.

My grandparents had a lot of antiques, some probably which they inherited. My grandfather was particular proud of his clockwork wind-up clock (which was an antique even back then). I disassembled it to find out how it worked, but couldn’t figure out how to reassemble it (and my granddad couldn’t either).

When I was a teenager my dad got a beautiful marble chess board. It was leaning on a wall, and when I picked it up it broke into two halves.

My dad was really sad and angry at me, that board meant quite a deal to him. He always thought I mishandled it, regardless how I said I was careful.

He died last November.

I got sent a few boxes with his belongings, and when I opened one of them I found that chessboard. It is glued with epoxy.

It sits in my apartment now, and I still don’t know if I want to keep it or get rid of it. One one hand it meant a lot to him, on the other hand it is one of the very rare things where I felt treated unfairly.

When I was around 12, I was learning about overclocking, and accidentally killed my dad’s graphic card, an Nvidia FX 5900.

I vividly remember launching The Sims 2 to test my overclock, when suddenly the screen started turning on and off (the video driver was probably crashing and restarting), and after I reset the PC, there were 2 green lines on the screen and XP was stuck in 640x480 16 colors because not even the basic display driver was able to load.

My dad was mad obviously because it was an expensive card, the damage wasn’t covered by the warranty, and he was into gaming too at the time. I was stuck with integrated graphics for about a month while we waited for the geforce 6000 series to come out.

I was so scared of overclocking after this happened, I didn’t try it again until a few years later years later when I had my own computer (and killed another card, a 9800GX2).

Our barnstable. I burned it accidentally. About half a million damage. Though the new barnstable was an upgrade.

You guys could’ve fixed that! You’d just have to open it up to reset or replace the button and hit the Degauss in the settings (assuming it had the option)!

My kid stuck a big ol donut magnet on our TV and ruined the screen.

ITT: kids with wayyyy too much time on their hands

• Latchkey kid

I noticed that the computer was magnetic and played with magnets around it. The hard drive was totally wiped. Now my parents could have reinstalled the operating system but they just got a new computer instead.

I’m not sure about “expensive”, but it was priceless.

My mom had a really gorgeous piece of petrified wood about the size of a cup coaster and as a young kid I was obsessed with it. So one day I broke into her jewelry box where she kept it and stole it to bring to school for show and tell. Everything was fine until I was getting on the bus to go home and I tripped with it in my hand. It shattered like glass and so did my poor little heart.

I remember crying all the way home where I tearfully confessed to my thievery and apologized up and down to my mom. She honestly wasn’t very angry, and was a lot more understanding than I thought she might be. I don’t remember what happened to the wood afterwards but I don’t remember seeing it ever again so I wonder if she trashed it? It was so beautiful, so that would be a total shame.

As a 10 year old I drove our car into a tree. It didn’t quite break though

Sigh…

When I was in the 3rd grade, our class had to do reports on countries around the world and we were all assigned a country. I got Egypt. Coincidentally, some friends of my parents had recently gotten back from a trip to Egypt. My parents asked their friends if there was anything I could bring in to use for my presentation. They let me borrow this little statue they got. It was an eagle with a hat, I think it was a depiction of Horus. It was carved out of some really nice white stone, maybe marble or something? I brought it into school, put it on my desk, and waited patiently to stand up and do my report. When I stood up, I bumped my desk, and the statue fell to the ground and broke in half.

Now monetarily this may not have been the most “expensive” thing, but it was the souvineer that this family brought back from Egypt that they had on their mantle to always remember the trip. It was priceless.

Why the fuck would you let a 7 year old bring your breakable souvineer to school for a class project?

Anyway, those people stopped being friends with my parents after that, so I have a feeling it was either expensive or meant a lot.

This hurts me to think about. Why did you have to ask this question?

My grandparent’s desktop computer. I didn’t break the hardware, but i set the default font size in windows 98 to some ludicrously high value. That made it so large the OS became unusable and the dialog to change it back was also unusable. Probably a quick terminal command would have fixed it within a couple seconds but I wasn’t old enough to understand that and my parents weren’t very tech-savvy.