In an email conversation the client asks for clarification about a behavior that exists that was never questioned for months. Upon clarification of said behavior the client claims that the feature is supposed to be totally different or they claim to remember that we agreed upon the new behavior. Our team cannot remember it was ever mentioned nor was it documented as a request. The change was rejected with a kindly written "fuck you there was never such a request" and "this use case was never mentioned, this is some new info". What a pleasure!