I moved out of a condo and got a bill for $1100 for new carpets to replace the "stained" ones I'd left behind. I hadn't seen any stains. And they couldn't show me the stains because the carpets had already been replaced before I was told about it.
When I said I wouldn't pay because they couldn't show me that there was any damage, they sued me for the money. The suit was over 100 pages. The lawyer I saw told me it would cost more to pay a lawyer to read the whole thing than to just pay them, and no lawyer would represent me in a suit without reading the whole document.