Sir Alex Ferguson was never angrier than when Manchester United lost at Liverpool, Gary Neville has told Sky Sports.
Current United boss Jose Mourinho takes his team to Anfield on Saturday, looking to keep pace with Manchester City at the top of the Premier League.
And Neville, who spent nearly 20 years at Old Trafford as a player under Ferguson, revealed it was the fixture that got his former manager going more than any other.
He said: "He was different going into the big games and, to be honest with you, the most consistently angry that I saw him.
"People talk about the hairdryer and it never happened that much during a season, but the most consistent place you would see it was Anfield, at half-time or the end of the game.
"The worst I've ever seen him consistently was at Anfield if we were losing at half-time or at the end of the game.
"He'd sit there unmoved in the dressing room at the end of the game while everyone was getting showered for 25 minutes. Just not moving.
"Once when I was a kid, just travelling, I remember him having a massive row with [Peter] Schmeichel and [Paul] Ince in the changing room. It was unbelievable.
"We always knew as well that they [Liverpool] could hear everything that was being said, probably laughing on the other side of the wall.
"He could not stand losing at Anfield. If we won there, it didn't matter how we played -- it was like the best thing in the world."
United have started the season with six wins and a draw from their opening seven Premier League games, scoring 21 goals in the process.
Liverpool, meanwhile, are seventh in the table after winning three and drawing three of their first seven matches.