He has not looked back since, lifting a pot a further 33 times - while his old rivals down the road have had to watch on enviously.
Ferguson said: "Winning the first trophy at any level is important.
"I've experienced that at Aberdeen, St Mirren and here. Winning in 1990 was a big moment for us but we were confident.
"It was a fantastic final, one of the better ones, 3-3, and we won the replay."