When the client asks why you billed them for something that was supposedlly your fault and takes a defense when you turn around with the emails and documentation to support that the code is working like it should and was requested by them... Awkward silence... And they still come back with well could you knock off half the hours. Client==fired

Side note.......have been having issues with this clent for a year so it was their time coming.

Don't you just love it when the lead developer/project manager comes in and totally revamps your code even though it does the same exact thing as it was written before? And then when it's not working he blames you because it's in GIT as your commit...