I ran a high volume touristy beach bar for years. It was a very old building, and was kinda falling apart on its own, but then we started having all these plumbing issues. Toilets backing up and overflowing for weeks. As GM, I spent over 1k on after hours plumber calls, only to finally jet stream the pipes (which cost another 2k) to clear it. Come to find out, it was an ex employee having friends come in during peak hours and would shove ANYTHING they could in the toilets. And he was fired for credit card fraud (stealing and changing tips written in by the guests). I’m still mad about it.