So to preface this, I accidentally broke a SDCC mermaid mermicorno that belongs to my sister. It was given to her as a gift and she loves the thing. 
Me, my mom and sister just came back home from the movies. I had to use the bathroom for a bit when I hear my mom telling me through the door that I need to change the bucket water that we use to clean the dogs pee with. So after I get out I do as she asks. I empty out the bucket into the toilet, and flush it down. Here’s where the fuck up begins. I open the shower door of the bathtub to replace the water and close the door a little harder than expected. The bathroom is right next to my sisters room. Apparently I closed it hard enough that the wall between the bathroom and the bedroom shook a little and what was on the shelves fell. At first I’m totally unaware of what just happened, but then she starts banging the wall and crying her heart out. “You just destroyed my limited edition mermicorno!” , she says as I see that part of the tail had broken off. My mother rushes into the room to comfort her and I’m just standing by the doorway as I’m watching her sob some more, eventually I can’t take much more of it so I just leave. After a few more minutes of hearing her heart wrenching sobs, the more and more I feel like shit. My mom comes out of the room and gives me the most accusing look. Apparently she’s told me time and time again that I shouldn’t close the bathtub door so hard because the wall shakes, but I sincerely can’t remember them telling me this. I was replacing some dog pads at this point and I just lose it as I scream at the tops of my lungs explaining that I feel like shit over what I had just done. I just closed a door, how could I have known this would happen?! I didn’t want to break this priceless toy of hers. My mom tells me to go fuck myself. I tried doing some homework to try to focus my mind on something else but I just become sort of catatonic at this point. A few minutes later I hear my mom talking on the phone, telling whoever she was taking to that “I know he’s my son, but he’s a fucking piece of shit...” it trails of because I can’t and don’t want to hear the rest of it. I just left the apartment and I’m writing this to just get outside the house. I tried looking up her toy to try to find a replacement. It’s sold out everywhere and the one copy is available on eBay for 800 dollars. It was genuinely an accident, and I may have been careless, but I feel like an asshole anyway.