Warning: SPOILER ALERT! If you don't want to be (possibly) spoiled, don't read on!

While Vocal Adrenaline might be nothing but a group of automatons on Glee, in real life they're made up of some really talented dancers. Like So You Think You Can Dance vet Lauren Gottlieb. And she tells Zap2it that those expertly choreographed performances aren't nearly as easy as they look!

"We shot the final episode of the first season and it was a six-minute long number," she says. "During the first run-through we had a broken pinkie and a sprained ankle. Later on, someone tried to do a dive roll, and his hand slipped and he cracked his head. Actually, it was Jason Glover from So You Think. So he had a concussion and he was out the rest of the day. You could see it in his eyes. It was not good. Also, someone did a head whip into the steadicam." Yikes! Or should we say ouch! Either way these dancers are not messing around. Still, despite the danger, Lauren couldn't be having more fun on the show.

"It's crazy and we love it because we're all together, so we just ham it up all day. But it's really sad to look over when we're shooting a scene with the main cast and Lea Michele is almost in tears. It's really sad. I'm definitely not that person to just stand there and laugh at someone for losing. And when you really see her go there, I'm like, 'God.' She's so good. I love her."

Source: Zap2it