It was the one that got away. Of all the failures and all the disappointments, it was the one that hurt the most and that still rankles to this day.
What is done is done, of course. Michael Beale cannot rewrite history but he can shape the future as he prepares for another Hampden head-to-head with Celtic.
The build-up to the Viaplay Cup final next month will naturally involve talk of the last time the Old Firm met when the silverware was on the line. Beale needs no reminding of it more than three years on.