When people email me at work to rant about being given a routine clinic appointment at a time that's not convenient for them. Fair enough, but when I email them back to offer two or three alternative dates/times, they then reply asking for different dates/times, etc etc. (Usually "before 8am or after 6pm" ) They then email back, after several hours, only to tell me that they'll keep their original appointment after all. Aaarggghh!