Kaka has been speaking out about one of the most famous games in European football history.
Yep, you guessed it, the Champions League final in 2005 against Liverpool.
Pretty much everyone knows the story by now. Led by Steven Gerrard, the Reds fought back from 3-0 down at half-time to pull level against AC Milan, before winning the game on penalties to earn a place in Champions League history.
For every winner there is, of course, a loser, and it happened to be AC Milan on that famous night in Istanbul.
The brightest star in that particular team happened to be the Brazilian playmaker - and 11 years on he's admitted that the loss against Liverpool still haunts him.
The 33-year-old, who now plays for Orlando City in MLS, told Radio Cope: "Honestly, years later I still can't understand how we managed to lose that game. We had the best defenders in the world in that team.
"Our back four was Cafu, Jaap Stam, Alessandro Nesta and Paolo Maldini but we still let in three goals in six minutes. Something amazing happened that can't be explained. All you can really say is that in football these things can happen. Especially in the Champions League, we have seen truly incredible things happen."
AC Milan would of course go on to get their revenge against Liverpool in the 2007 Champions League final, earning a 2-1 thanks to a brace from striker Filippo Inzaghi, but their revenge is often overlooked in favour of their defeat in 2005.
"It was one of the greatest finals of all-time," Liverpool legend Jamie Carragher said recently. "People will be talking about it in 20 or 30 years time. I don't think it can ever be bettered. Obviously this club can win the European Cup again but I think it's the way we won it that made it so special."