It's a quirky American thing. But plenty of other countries do it to. Not surprisingly it originates in sports like most of these kinds of chants. Go to an international football/soccer match sometime and let me know how many national chants you hear.
In Chile, I've heard the chant is something like "CHI CHI CHI! LE LE LE! EN EL MAPA NO SE VE!", here's a comedic routine around it https://www.youtube.com/watch?v=Gigjq9GExuE
If France had a SpaceX equivalent that did something as amazing as this, it would be completely appropriate for the French people who spent years of their lives achieving something thought impossible to suddenly break out and start singing La Marseillaise or chanting.
If it happens for something as unimportant as a sporting goal, it's probably okay for it to happen for something that advances the entire species.
I'm kind of surprised by all the people from different countries that aren't even aware it happens in their own country or that they might have a similar national chant.
I'm pretty sure they were definitely mocking the American U-S-A chant, but everybody was having a fun time of it. Americans and Brits are always giving each other some ribbing anyways and I think everybody understood that these kinds of chants are kind of tongue in cheek in many ways.
Good points. I don't know if the Mexican one counts though. They're saying "Si, se puede" which I believe translates to something like "Yes we can". You can also hear that chanting alongside. It does not appear to be nationalism, except to the extent that it's Spanish chanting in US Congress.
https://www.youtube.com/watch?v=FwHFm3pBA90 ("TAE HAN MIN GUK!" "Great Korean People's Country")
Here's a show giving fun lessons on how to properly do the chant https://www.youtube.com/watch?v=_Wli6OrUhNU
Here's the history of it
https://en.wikipedia.org/wiki/U-S-A!
I've heard a bunch of Brits chant something similar "UK! UK! UK! UK!" before.
Here it is in Uraguay https://www.youtube.com/watch?v=nub526rufzk
In Canada https://www.youtube.com/watch?v=KiK3f-fEDdY
In Chile, I've heard the chant is something like "CHI CHI CHI! LE LE LE! EN EL MAPA NO SE VE!", here's a comedic routine around it https://www.youtube.com/watch?v=Gigjq9GExuE
Here's the Mexican equivalent https://www.youtube.com/watch?v=s1ips57oLX0
Here's Sweden after a sports win https://www.youtube.com/watch?v=jkfqHCwB4aY
If France had a SpaceX equivalent that did something as amazing as this, it would be completely appropriate for the French people who spent years of their lives achieving something thought impossible to suddenly break out and start singing La Marseillaise or chanting.
If it happens for something as unimportant as a sporting goal, it's probably okay for it to happen for something that advances the entire species.
I'm kind of surprised by all the people from different countries that aren't even aware it happens in their own country or that they might have a similar national chant.