Forgotten Lyrics, Failed Stunts: Only Steady Footing Shines in a Weird Week of 'America's Got Talent'

It's "bright lights, big city" time on "America's Got Talent," folks. The audition rounds may be over, but if the acts that made it through to Vegas week thought the hardest part was behind them, they were sorely mistaken. Even the best was literally hanging in the balance.

Before a single Las Vegas performance, three acts were sent home and three were sent straight through to the live shows. The rest were left to battle it out onstage, but the nerves in the holding room claimed performer after performer, leaving a trail of forgotten lyrics, missed stunts, and crunched bike wheels. Let's take a look at some of the night's most memorable moments.

Hanging in the balance

Cristin Sandu's name isn't an easy one to forget, nor is his act likely to slip your mind. This 17-year-old likes to balance precariously on metallic tubes, which is a lot more difficult than it sounds. While "AGT" loves a performance that makes you cringe, we have to wonder how long it will be before this act gets stale or Sandu breaks a bone.

Pitch perfect

The female singers had a particularly brutal round, as one by one, the judges' favorites blew their chance at "AGT" fame. Nikki Jensen, a former Australian journalist, saw the missteps of her fellow auditioners and refused to let anxiety stand in her way.

Flipping out

Both Loyalty Dance and the 787 Crew came to Vegas ready to take down the competition, but after a lackluster performance by Loyalty, 787 felt they had the spot all sewn up. Then a missed flip caused a minor head injury -- and a very noticeable error.

Night moves

With "AGT," there are always a few acts dancing in the dark, which can be both dangerous to do and breathtaking to watch. Early favorite Aurora Light Painters continued with their unique and colorful style but weren't so confident about their chances against Joe Castillo, the patriotic sand artist.