The crews literally lit the stage up at last night's ABDC taping (and we ain't just talking about the disco-themed dance floor!), but the coolest surprise was when Oscar nominee Gabourey Sidibe showed up. She came to support the crews (and to steal a hug from her celeb-crush JC Chasez). Here are some more highlights from the evening:

— Role reversal happens as one tiny female picks up her male counterpart!
— One crew starts working out mid-performance.
— An injury has dramatic results on one of the dancers and their crew.
— One crew releases a walrus on stage!
— Omarion compares a dance mistake to a car crash. [source]

Pictures in the gallery.