While performing Edge of Glory and walking over a fire exit set made to look like the music video, Lady Gaga bends over one of the railings, away from the audience, and lets loose. She then approaches one of her dancers and slips behind him so she can hurl the rest out while he dances in front of her.
Amazingly, she continues the song once she's got it out of her system.
Lady Gaga poked fun at herself later on Twitter. "Was praying nobody saw but actually its quite a good laugh if u need one!" She posted, along with "it WAS pretty metal. Belligerent throw up during sax solo amidst epic power ballad about glory atop medieval castle? #metal."