Following their historic 2-0 win over Belgium at the World Cup, several Morocco fans stayed behind to help clean up the Al Thumama Stadium.
Goals in the second half from Romain Saiss and Zakaria Aboukhlal were enough to secure Morocco's first victory at a World Cup since 1998.
Supporters inside the stadium created a raucous atmosphere which rattled Belgium, who are second in FIFA's world rankings.
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They remained inside the ground at the full-time whistle to celebrate with the players. What followed was a remarkable show of respect for their hosts. Check out the video below.
A woman is seen carrying a blue bin bang around her row, allowing fellow spectators to chuck their rubbish away.
She then moves further down to clear the floor of anything left behind.
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Seconds later, a man takes the bag off the woman to continue sending it around the stadium.
The clip has gone viral on social media, with Reddit users praising their conduct.
One person said: "No matter the reason, it's a good behaviour, it would be better if we were all like that."
Another commented: "You love to see this. Hopefully it catches on."
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While a third joked: "Clean the stadium. Cleaned the Belgium team. Finished with a clean sheet."
It's a practice Japan fans have received a lot of praise for in recent years. They earned plaudits during the 2018 World Cup before continuing to show their class at this year's tournament.
Japanese supporters inside the Al Bayt Stadium for host Qatar's 2-0 defeat to Ecuador eight days ago made sure to leave the stands spotless before departing.
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It's a classy gesture which appears to be making its way around the entire football fandom this autumn. Hopefully, it can continue.
Just why do Japanese supporters do it? Back in 2018, Japan-based journalist, Scott McIntyre told the BBC: "It's not just part of the football culture but part of Japanese culture.
"You often hear people say that football is a reflection of culture. An important aspect of Japanese society is making sure that everything is absolutely clean and that's the case in all sporting events and certainly also in football."
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Morocco are currently second in Group F level on points with Croatia, who defeated Canada 4-1 later on Sunday.
Topics: Belgium, Football World Cup
Daniel Marland