So, if you've ever seen a performance of anything in Chile you know those fans go absolutely nuts for whatever act is performing. In this case, it was the Foo Fighters getting some love and then both the crowd and the band collaborated for a new song.

The Chilean chant, you know, that "Olé" chant, gave Dave Grohl an idea, to which he turned into a song with the band following right behind him in perfect rhythm.

It's simply something really cool that you never see happen, so check out the video below...

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