Singer Miguel tweeted that he just "got caught up in the moment" when he leapt over the crowd at the Billboard Music Awards and landed on a fan's face Sunday night.

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The televised accident serves as a reminder that although most concert-goers find themselves in the medical tent because they're dehydrated, more serious injuries can happen.

For instance, concert medical tent volunteer Penny Miller said she watched in horror when a Rolling Stones fan fell from a third-floor stadium balcony, bounced off the second floor balcony and fractured his skull at the Oakland Coliseum in 1981.

"He only lived to tell the tale because he received medical care right on the spot," said Miller, a nurse practitioner in Sacramento, Calif., who has volunteered for Rock Medicine since 1977.

Concert injuries vary depending on the performer, said Gordon Oldham, who directs Rock Medicine, a 40-year-old volunteer organization that provides free "nonjudgmental" medical care at more than 700 concerts and events in Northern California each year.

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Ethan Miller/Getty Images

For example, the Grateful Dead fans are going to have different medical needs than the hard-core punk crowd, which forms "mosh" pits at in front of the stage, where people slam-dance into each other, said Oldham.

"There's pit etiquette," Oldham said. "If somebody falls down, they help them back up."

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Rock Medicine for Deadheads, Punks