Possibly my worst ... my Desk officer telling me I'm going to be posted to Lossie just as the OH was posted to Bracknell. 450 nm as the crow flies? The conversation was less than friendly, with me assuring him that my PVR could hit the system faster than his posting instruction!
Happily, an ATC contributor here picked up acting rank and took the job, and I remained South and collocated! Thanks again, Hugh!