i'll go first. this actually happened to me very early this morning. (it's kinda long, sorry.)
disclaimer: my sister isn't neurodivergent, or anything else that would explain this meltdown.
time: right before 1 am
setting: my sisters' bedroom (i was sleeping in there bc my step-grandfather was visiting, and he stayed in my room)
i was, obviously, asleep, as it was around 1 in the morning. i woke up to the sound of somebody beating on something soft-sounding. i looked down from the top bunk to see my sister (who will be referred to as 12 from now on) was sitting up and beating on the bed. my other sister (who will be referred to as 5 from now on) was asleep, but uncovered. this was bc 12 has thrown the blanket into the floor. so i said, "what are you doing?!" rather angrily.
12 started crying, and told me she can't sleep bc her blanket has clothes in it. for a moment, i thought she meant some pants or something were wadded up inside. but then i realized, no, there's not. i knew this bc i had been in her bed right before we went to sleep, and there were no clothes there. so i asked, "what?"
she said, "it's full of clothes, all in the inside."
i said, "no it is not. how is that possible? quit crying, cover up - or at least put a blanket on 5 - and quit freaking out!"
she just sat there, muttering. so, i got down from the top bunk to see what was up. she laid back down, and i assumed this was all over. being the kind human i am, i covered them back up. 12 bolts upright and throws the blanket back in the floor. "no!" she screamed. "i can't use that! it had cake in it!"
i said, "what? cake? that's impossible. lay down and go to sleep."
she was inconsolable. freaking out, convinced her blanket was made of cake, so therefore, she couldn't use it. i didn't know what to do, so i go downstairs to get my mom. as it turned out, i don't need to wake her up - she was already awake and making poor decisions (ie, buying hulu at midnight). i briefly explained the situation, and we went upstairs. 12 was still freaking out. it got to the point where we had to get her a completely different blanket bc we could not convince her that the blanket was not, in fact, made of cake.
thinking it was all over, my mom went to bed. while i was up, i went to the bathroom. when i got back, 12 scared the sh!t out of me bc she was, unexpectedly, standing in the doorway. she was sobbing, eating snot. and that was when she told me, "this blanket won't work either. it's made out of life sized cake!"
i asked, "what are you talking abt? all cake is life sized, it's real."
"no," she sobbed. "this one is life sized bc it's" - here she paused to draw a box around my body - "like that! and they're making it from humans!"
after 2 seconds of careful consideration, i told her to go downstairs. she slept there the rest of the night. when i asked her later this morning, around 7, she claimed to remember the whole thing, but had no explanation as to what was up. so yeah, that was my morning.
