Barry Robson scored against Barcelona at Celtic Park and fired a winner against Rangers at the same venue but insists those moments of glory will be eclipsed by winning the Scottish League Cup final for Aberdeen.
The 35-year-old midfielder is enjoying an Indian summer of a successful career in which he earned 17 caps for Scotland.
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His looping header over Barca keeper Victor Valdes at Parkhead in 2008 opened the scoring for Celtic - although the Catalans eventually triumphed 3-2 - and converting a penalty for the winning goal in an Old Firm game later in the same season, are two of the personal highlights to date.
However, Robson, who also won the League Cup with Celtic in 2008-09, will be even happier if he gets his hands on what would be Aberdeen's first trophy in 19 years.
The Dons veteran, who started his career with final opponents Inverness, said: "Lifting the trophy has been better than any other achievements in my career. I am very much into the team ethic.
"If it is a goal against Barcelona in the Champions League or scoring in an Old Firm game, when I have achieved as a team, it feels so much better and you can share it with your team mates.
"That's the way I have always been and hopefully we can do that this weekend.
"It was a great feeling winning the league with Celtic, it was the first time I had ever won anything.
"It is an addictive feeling and one that you want to keep on coming.
"Winning it on Sunday will definitely will be as good as anything I have ever done before."
Around 40,000 Aberdeen fans will converge on Celtic Park, outnumbering their Inverness counterparts around by four to one.
Despite his vast experience and having played at the cup final ground on numerous occasions, Robson admits he will still have butterflies in his stomach from the minute he wakes up on Sunday.
The former Dundee United, Middlesbrough and Sheffield United player, who also had a spell at Vancouver Whitecaps in Canada, said: "The young players will be nervous but so will I, so will everyone.
"That is the passion and love you have for the game.
"It must be a myth that no footballer or top sportsman gets nervous.
"Do you think Roger Federer, when he is about to play a Wimbledon Championship, is not nervous?
"Of course they are. That drives you on, makes you feel sharp. Nobody is immune to it.
"You are not going to play in a cup final in front of all your friends and family, with 40,000 of your fans in a great stadium, with the game live on television and it is not going to mean anything to you.
"Anyone telling you different is telling lies.
"I could be playing in front of 500 people and I would still have that same, wee nervous feeling.
"It is a great feeling and hopefully that is what our boys will have at the weekend and we can go out there and be as good as we can be and try to make it happen."