Oh my GOD. The (important part of the) description of this video says:
Phantom Regiment drumline parking lot warmup of their “closer” on 10 August 2007 in Pasadena, CA, for DCI semi-finals performance…
… and I had been watching it for more than a minute when I realized “HEY THAT’S NOT A PARKING LOT SOMEWHERE IN PASADENA! OMG IT’S MY HIGH SCHOOL. OMFG.”
Yeah. I get excited about the weirdest things, I know.