My story really needs it's own post, but the short version is I asked a client for a normal piece of information and he wrote a letter to each of the owners of the firm (separate ones posted, and they work in the same building) telling them how awful I am and how he's caught me out (?!) and how he's demands we finish his job. Hint: it didn't work and we dropped him as a client.
It's a bit late for that I think