With two autistic adults (adult diagnoses) in the home, quite a lot of things get broken when one or both of us have a meltdown. This is involuntary, it's something that we have limited control over.
For example, I melted down after someone (a customer) had been rude and vile to me at work - demanding that I be brought out of a staff meeting to give him a tour of a building, demanding that I arrange for him another tour at a building that our workplace has no connection with and getting shirty with me when I told him that this wasn't possible. Even other staff and customers said that he was unreasonably rude to me. I managed to hold off my meltdown until I was home, but when I did get home and tried to tell DH about it, I just let out ragged wailing and eventually threw a tankard at a door. The tankard was fine, they're sturdy things, but the door now has a chunk of plasterboard missing. After that, I just sobbed in DH's arms.
My husband will sometimes meltdown - he especially gets uncontrollably angry and upset if I am hurt in any way. He repeatedly hit a chair on the floor because our downstairs neighbour was playing music at some ridiculous hour and I was beside myself because I couldn't sleep. He has also banged the doors and loosened the plaster after I have received antisemitic abuse.
It may surprise you to know that aside from meltdowns which occur when we are really overwhelmed (all of the incidents described took place after a series of overwhelming events - not as standalone incidents), we never get angry with each other. We never have arguments. Each of us knew that the other was autistic when we decided to live together and marry and we knew what we were signing up for. DH feels horribly guilty and upset when the meltdown has spent itself - of course he does, you're in a completely different frame of mind when you melt down. I assure him every time that it's all right. I understand.