Green Day was playing at Hurricane Festival in Germany when Billie Joe snapped on a fan who had been squirting him with a water gun throughout Green Day's set. In the viral video, Billie stops mid-song, takes off his guitar, bends over, and goes off. You can clearly read his lips saying:
"You better effing quit or I'm gonna beat your ass. You understand me?! Eff you, alright?"
And then he gives the dude a thumbs up and casually jumps right back into the song like nothing happened.
People on Reddit who were at the show said the fan had been squirting him all night and Billie had finally had enough. Honestly, the guy's lucky he walked away with just a warning and a thumbs up. Billie Joe's not the one to mess with.