The evening’s most memorable moment came when MacFarlane performed a duet with Adam Levine of Maroon 5, and a young woman in a black dress rushed the stage to dance between them. She flailed and twisted around as they sang a spirited rendition of Michael Jackson's "Beat It." A few moments later, she stepped on the leg of a mic stand, causing it to hit her in the head. She then fell down briefly. Undeterred by the tragedy, another woman hopped onstage and was politely removed by security. “Train wreck, this is a train wreck,” sang MacFarlane and Levine amiably.
Source: LA Times