I saw the Foo Fighters in 2008. Nothing crazy like that happened but it was an absolutely amazing show. The highlight was Dave heading to the B-stage with his acoustic guitar for Everlong, then leading into the bridge and all the lights went down. It was silent for a good 5-10 seconds until he just starts running back to the A-stage, all the lights went up, and the whole band started going hard as fuck and he screams “YEAAAAAAAAAAAAAAAAAH” and they did the last verse as hard as I’ve ever heard it. The energy was insane.