The Brazilian, Roberto Firmino headed home from close range after a sublime volleyed cross by Andy Robertson.
But the two ended up celebrating the effort which made it 1-1 in bizarre circumstances.
They both instinctively wheeled away in opposite directions and Liverpool’s team was divided in the process.
Firmino’s equaliser didn’t keep the Reds on level terms for long though.
Leroy Sane put City back in front in the 72nd minute at the Etihad.
The Germany international drove at the Liverpool defence before hitting the ball across Alisson as the ball came off the post and ended up in the back of the net.
City managed to hang on and close the gap at the top of the Premier League table to just four points.
The title showdown was an enthralling contest throughout with both teams looking to secure all three points.
Liverpool very nearly took the lead in the first half but goal-line technology ruled the ball to be 11mm away from crossing the line.
Then Vincent Kompany was perhaps lucky to get away with just a yellow card for a rash tackle on Mohamed Salah.
That was before Aguero gave City the lead.
The second half saw two more goals, a Pep Guardiola tantrum and efforts close at both ends.
But it was City who picked up all three points to ensure the title race will be a thriller.
Both Liverpool and City return to action at the weekend in FA Cup third round action.
What caught the attention of many fans is Klopp’s celebration after Roberto Firmino levelized for the REDS.
Here is the Video
And weirdest celebration of the season goes to… Jurgen Klopp.
😡🍼
Watch live on Sky Sports PL & Main Event or follow here: https://t.co/AlaCpCXy8J pic.twitter.com/5vQavPRxrh
— Sky Sports Premier League (@SkySportsPL) January 3, 2019
Jurgen Klopp was so excited after Roberto Firmino's equaliser he has to pull out his stress b̶a̶l̶l̶ water bottle 🤨 pic.twitter.com/rJSm2R7DDc
— Soccer AM (@SoccerAM) January 3, 2019