Client (not for the first time): Your work sucks. I had to have this email formatting re-done before I sent it out.

Me: *sees that the email sent matches the work I did exactly with no changes*

Client (months later): I need you to do maintenance on my website.

Me: *does quick maintenance for free but sends update on status of work done and amount left in retainer agreement*

Client: You're too expensive! You started working with me for $X/hr, then you went up to $Y/hr and now you're all the way up to $Z/hr! You're not worth that!

Me: *fires client by refunding the remainder of retainer and sends client a list of local, cheaper providers*

Client: But now I don't have anyone to maintain my website until I find a new provider! Why have you done this to me? Waaaahhhhh!

Me (in the most professional language I can muster): Because you're a biotch and I'm tired of your verbal abuse. Maybe try not to be such a dbag to that next provider, mmm'kay?