I've taught in permanent portacabins where some of the children had to wear their coats all day from October to March because it was so cold. And on the flip side, they were boiling in the summer.
I've taught in a school that had a rat(s) who lived in the photocopier room and it was just seen as par for the course.
I've had a strip light fall on a child's desk (luckily not the child). I've had ceiling tiles fall (luckily not while children were in).
I've taught in a school where everything was online but the internet was appalling.
Don't even get me started on mouldy staff toilets (oh god the amount of mould) and the ingrained stench of pupil toilets.