The last player who looked as genuinely upset after scoring against his former club as Frank Lampard did when he scored against Chelsea on Sunday was also wearing a Manchester City shirt.
It might now be more than 40 years since Denis Law back-heeled the ball into the Manchester United net and effectively condemned his old club to relegation, but it is often shown on television and remains an iconic image from the 1970s.
Law, one of Manchester United's all-time greats, walked back to the centre circle looking stunned and forlorn.
It was his last league goal and, as he said later: "I could not believe I was the player who sent United down. I have seldom been so depressed as I was that weekend."
Opinion is split on Lampard's reaction on Sunday.
Hundreds of users poked fun at him on social media sites and others "respected" his actions. At the end of the game both sets of fans applauded him off.
The 36-year-old former England midfielder, who played 648 times for Chelsea, came on for David Silva after 78 minutes with City trailing 1-0, but seven minutes later he scored to make it 1-1, which was how the game ended.
The result brought Chelsea's perfect start to the Premier League season to a halt, saved his current club from a second successive home defeat, but left him dazed and confused.
"It's a really difficult one. I'd be unprofessional if I came on and didn't do my job so I'm mixed with it," he told Sky Sports.
In a perfect world, Lampard would have hugged his teammates with joy at scoring.
Instead, he held out a hand signalling for them to keep away, which they ignored and engulfed him anyway.
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