comments:
I don't know what you mean by bars being in the wrong direction or bars resting across others. You can get better pictures of the bed frame design looking at the listing for this identical one though: https://www.walmart.com/ip/385482674 To me, it looks like the slats slipped free of the support bar nearest the camera first, and then fell loose from the support bar against the wall as the mattress pressed down. Update: found a bare bones image that shows the frame layout with the slats exposed:
Pretty sure it's this bedframe, if not from this seller: https://www.walmart.com/ip/385482674?
None of the lengthwise bars fell. Those are not what fell on the mattress. The “slats” did. Yes, that's correct. I’ve seen some with a couple lengthwise bars for extra stability if it’s a larger size, but it’s not this many. On top of that, the lengthwise bars go throughout the whole length. Did you miss that the lengthwise bars are railings outside of the rectangular base they and the slats were connected to? It's just the bed's design: https://www.walmart.com/ip/385482674?
Bed physics are not AI. I'm pretty sure this is the same bed frame I assembled for my kids a couple months ago. This is a very believable outcome if this frame was not assembled properly. Among the slats are several you are meant to anchor with bolts from the side so that the distance between the two long support bars does not change. They are not super obviously different beyond having a spot at either end that a bolt can anchor into. This matters because the remaining slats fall free if the two bars are far enough apart. Getting everything assembled and lined up is also a NIGHTMARE even knowing this, so someone who grabs the wrong slat for the part that anchors and doesn't realize until later would be reluctant to fix it. I made that error, and I definitely cursed when I realized my mistake. So... I imagine this bed did not have any slats anchored as intended. Then, with the big kid's weight centered towards the middle of the mattress, the bed rails were pushed just far enough apart to cause the majority of the middle slats to collapse free. The end slats stayed in position because the sides were not as far apart there. Anyway, for this bed frame, what we witness is entirely possible if the slats were not anchored, and not anchoring them is a realistic assembly mistake. Link to the frame I have that matches the video one: https://www.walmart.com/ip/385482674? Edit: In case it's not clear, I think the center of the metal support bars bowed out slightly with the weight, which allowed the first slats to fall, which allowed the mattress to start sinking in the middle, forcing the support bars farther apart, which freed the remaining slats and allowed the mattress to fall through. This obviously happened very rapidly, but if you look closely the first slat to fall is a middle one, followed by the nearest slats, followed by the remaining slats that did fall.
I couldn't find anything obviously suspect to me, and my kids sleep on a bunk bed identical to this one. I'm glad to hear it was likely an assembly issue. Ours seems fine and sturdy so far. Link to frame for the curious: https://www.walmart.com/ip/385482674? Edit: I thought about my own assembly experience and realized what mistake they likely made. Wrote an explanation in this comment: https://www.reddit.com/r/isthisAI/comments/1rh7iit/comment/o7xd2dv/?