I was selling a house, and the property taxes went up substantially because of the improvements they noticed. Fine, it's probably fair, I sent in the interim tax checks.
The township didn't deposit them for months, to the point where the taxes were going to be deducted from me at closing because nobody could certify that I had paid them. I had to call up the township and make them search through the evident piles of checks in one of their offices, find mine, and deposit them. Then I had to get them to send me a receipt, because the county wouldn't certify them as paid for a few weeks. Infuriating.