Bedbugs. They bite you in your sleep and multiply like crazy in your furniture. My super was just telling me about this last week. Where I live has two buildings as part of a complex. A lady in the other building refused to tell anyone on staff that she had bedbugs.
Our super only found out when he had to fix something in her flat, and came upon an infestation of the fuckers in her flat, concentrated in her bedroom. She had been too “embarrassed” to tell anyone. In consequence, not only did everything in her place have to be destroyed, but also five of her neighbors had to get rid of everything they owned, and were getting bites and so on. For months, they’d been calling in the exterminators and wondering why the problem wasn’t solved. They all sued her. I think the cases are still in court., though how they’re going to get money out of a retired teacher is beyond my ken.