Remember one time we were at a remote location with our TC POI on board for the ride. Guess what? As we are getting ready to start, one of the ADI's toppled for good at our remote location on that crystal clear day. No MEL relief of course. The captain wanted to go as he was an old school type and I would not have had a problem except we have a Transport guy on board.
As I pulled out the MEL, the TC guy says "I think it failed on the way home".
And that is how it was written up, on the way home.