My pals and I rented a house on the Spanish coast a decade back, some of us were on bunk beds (only my second time ever). On the penultimate morning, I completely forgot where I was and stood up, smashing my back into the bunk above at just the right angle to mess up one of the lower discs. It's mostly manageable now but that shit took literal years to get back to a relatively normal state.
That plus a horror story with my uncle in his later years has left me incredibly cautious and wary in my movements nowadays.
I do remember last time I moved house, I had a big crate full of books that was, in hindsight, a poor choice as the sheer weight was crushing. Some tall, relatively slim guy was one of the movers and went to grab the crate. I went to warn him to be careful but he DNGAF and I watched in awe as he hoisted this massive, heavy ass crate up like it was full of feathers and pootled off to the van. I would have crumpled in approx 0.8 seconds if I tried that...