Not the worst day of my life of course, but in terms of my least favourite day of the year, that takes No1 spot.
The waiting!
Will it pass? If it doesnt how much will it cost? And of course, despite you getting it there shortly before cock crow, the call never comes before last thing in the afternoon. If you have no tech knowledge, how can you be sure that they garage isnt trying to rip you off (although I now use the local council test centre that doesnt do repairs now, and oddly enough they seem to fail cars far less than other repair garages do)
I was on tenterhooks all day today (yes, it was today) because although I didnt think there were any issues, I also didnt think there were any issues with my old car, which turned out to have utterly fucked suspension to the point where it was cheaper to write it off.
I just find it so fucking stressful, perhaps being on a low income contributes, but even when I was doing well I still hated MOT day!