Kevin De Bruyne struck in the 79th minute to spare the blushes of Manchester City and earn them a hard-fought 2-1 victory in a rip-roaring FA Cup fourth-round tie at Leyton Orient.
The League One side went ahead in remarkable fashion after 16 minutes when a 40-yard lob by Tottenham loanee Jamie Donley hit City goalkeeper Stefan Ortega and went in to send the Gaughan Group Stadium into pandemonium.
Donley was denied on the official scoresheet as the strike went down as a own goal, but both camps, as well as the delirious crowd, acknowledged his memorable moment.
"It is a shame it has gone down as an own goal," said Leyton Orient boss Richie Wellens. "It is not deserved and I am sure Ortega doesn't want it.
"It is one thing seeing it, it is another executing. The lad has talent."
Pep Guardiola had watched City get thumped 5-1 at Arsenal last Sunday and would have feared more London woe but substitute Abdukodir Khusanov deflected in Rico Lewis' strike to level after 56 minutes.
De Bruyne was brought on soon after and poked home with 11 minutes left to break the hearts of the O's and their Manchester United-supporting boss Richie Wellens as the Premier League champions progressed into round five.
The verdict on the Orient opener...
Leyton Orient's Jamie Donley
"I knew I hit it well and it had a good chance. It fell for me nicely and I saw him off the line. Disappointed we lost but it's a good moment."
"We knew it would be a tough game but we made a good account of ourselves. I'm proud of all the boys.
Manchester City boss Pep Guardiola:
"What a goal. Fantastic - he shoot, the quality, the technique and the speed, the flight of the ball.
"When you concede this goal, it is just congratulate the guy. I think it was Donley. He is an incredible left-foot player."
Donley's goal that never was!
Guardiola: I won't get sacked in the morning now!
Manchester City boss Pep Guardiola:
"They sing, 'you are going to get sacked in the morning' but it is a routine in all the stadiums now!
"With this result, I don't think my chairman is going to sack me tomorrow! It is really good.
"I like playing in the lower divisions, I like the way the team behaves."
Lewis: Everyone wants to see City lose
Manchester City defender Rico Lewis speaking to the BBC:
"In this environment, it is easy to let the pressure get to you.
"A shot from the halfway line when we created so many chances. Sometimes that is football. We got the result we needed. Credit to Leyton Orient.
"We all know these games are difficult to play. We have enough leadership to push our way through.
"Everyone wants to see us get beat! There is pressure on our shoulders in every game. We settled our heads at half-time."
Wellens: It took the big boys to beat us
Leyton Orient boss Richie Wellens speaking to the BBC:
"We created chances and caused them problems. The goals are so obvious. Disappointed in the last goal as it's something you highlight all week.
"At least it took the big boys coming on to beat us! The way they defend, you can get into races. In terms of the whole day, brilliant atmosphere and brilliant for the supporters.
"Our chairman is buzzing that he got to meet Pep [Guardiola]!"
