Liverpool beat Sunderland 2-0 on Saturday to return to the top of the Premier League - albeit temporarily - but Jurgen Klopp was left more than a bit unsatisfied after the game.
Key man Philippe Coutinho being stretchered off with a serious-looking ankle injury in the first half certainly wouldn't have helped Klopp's mood.
And as the Reds struggled to find a breakthrough in the second period, the nervous tension in Anfield began to build - much to the manager's disliking.
The German manager gestured furiously to the home fans after they appeared to groan following a misplaced pass and Klopp clearly felt his players needed more support to break down Sunderland's resistance.
The Black Cats, who look set for another tricky battle against relegation this year, defended doggedly before Divock Origi eventually broke the deadlock.
James Milner's late penalty sealed the win but it didn't stop Klopp aiming a sly dig at his opposite number by labelling Sunderland the most defensive team he had ever seen.
David Moyes, who even suggested before the game his side would park a double-decker bus to stop Liverpool scoring, has hit back at Klopp's claims.
"Maybe if I was a foreign coach I would’ve been praised for that," Moyes said.
"We don’t have the same quality as Liverpool. I knew we had to come here and defend. They won 6-1 here the other week so we didn’t want to come here and get rolled over that easy.
"I was at the Euros all summer and saw a tournament like that. A tournament of big teams having to play against teams who shut up shop and made it difficult to get through. It’s a big part of modern football now as well - it can’t always be one-way.
"I hope soon I can come with a team that can give Liverpool an open game. At the moment I don’t have the team to do that."
Moyes might have forgotten but he actually did have the opportunity to play an open game during his sole season in charge of Manchester United.
However, it didn't exactly help as Moyes' Red Devils suffered a 1-0 defeat at Anfield in 2013.
Saturday's loss extended the Scot's unwanted record of never recording a victory away from home against Liverpool - not a record to be proud of, unless you support the Reds of course.