You already know about Green Day's epic fireworks shooting, cover-medley-rockin,' two-and-a-half-hour headlining set Saturday night (Aug. 7). But lots of other memorable things happened during on Lollapalooza 2010's second day. Here's 10 things that we saw and heard on the stage and in the crowd at Chicago's Grant Park on Saturday.
1. Against Me!'s Tom Gabel told Billboard.com that the first concert he ever saw was Green Day, when he was 13 or 14 years old.
2. Blues Traveler covered Sublime's "What I Got" and Radiohead's "Creep" while later, on Perry's DJ stage, Joachim Garraud brought the bass mixing in beats from Coldplay, Fatboy Slim and Deep Purple to the body-movin' crowd's obvious delight.
3. Scooby-Doo was spotted crowd-surfing during Gogol Bordello's set.
4. Edward Sharpe & the Magnetic Zeros ended their set by having the crowd sit down around frontman Alex Ebert and his guitar.
5. "That's not where a hand goes!" - Guy in jam-packed Edward Sharpe crowd as a girl is trying to push past him.
6. "Look at all the hippies in the trees" - fan standing on the outskirts of the Edward Sharpe crowd.
8. After explaining how he rushed to put fan video of Lady Gaga crowds surfing to Semi-Precious Weapons on his Facebook page, Lollapalooza founder Perry Farrell told Billboard.com that "She embodies what alternative music is all about."
9. "I don't see nothin' wrong with a little bump and grind" -- John McCauley of indie folk band Deer Tick
10. A fan kisses Green Day's Billie Joe Armstrong on the lips. Billie convinces another to stage dive. Later, the whole crowd tears up as Armstrong gives a fan his guitar after the young guy ably sings all of "Longview" at Billie's invitation. Even before Billie gave him the guitar, the screens caught the guy hugging the lead singer unabashedly and whispering "I Love You" in his ear.