NBC's "America's Got Talent" reached its boot camp stages on Monday night, when the acts who survived the national auditions got another chance to impress the judges, this time in Las Vegas. Howard Stern, Sharon Osbourne and Howie Mandel were treated to encore performances from dance troupes, novelty acts and opera singers, all introduced by host Nick Cannon.

The competition was hot as the field was narrowed down immediately to two groups: the "judge's favorites" and the "standbys." Some acts were sent home on the spot after learning that they did not make either group.

The judge's favorites would get the first chance to perform again, with the remaining standby acts filling any vacant spots, if and when they became available. There are 48 places set aside for the upcoming live rounds; however, Monday's featured performers made life difficult for themselves. Here's a rundown of what happened:

- In a danger acts segment, The All Wheel Sports Team and the American BMX Stunt Team went head-to-head as competing acts on two wheels. One of the BMX team members took a fall and broke his bike.

Balancing act Christian Sandu stood on a variety of metal tubes, which were precariously piled on top of each other. Ben Blaque, a quick-fire crossbow act, shot and burst balloons above his female assistant's head, blindfold and with his back turned.

- The female singers included Mary Joyner, daughter of the late track and field star Florence Griffith-Joyner. Unfortunately, Mary performed poorly, as did Roxy Doll, Brianna Price and Cecilia Detweiller.

Luna, who came from the St. Louis auditions, overcame her stage fright, only to break down and forget the words to "If It Makes You Happy" by Sheryl Crow. Many tears were shed.

Nikki Jensen was the last girl to perform, with an acoustic version of "You Can't Always Get What You Want" by The Rolling Stones. Nikki was told that she had an original voice, but it remains unclear if she will advance.

- Of the many dance groups, Funk Beyond Control performed a jungle-themed routine, while tap boys All That! strutted their stuff in plaid. Puerto Rico outfit 787 Crew almost outshone the family group Loyalty Dance Team, but suffered from an on-stage accident when two members clashed. Undaunted, the 787 Crew carried on, and both acts await the judges' decision.

- In the novelty acts section, Horse - who calls himself "the king of nut shots" - had various things thrown, prodded and struck against his body "below the belt." It was noted that Horse does not wear a protective cup.

All Beef Patty is a drag queen in the style of the late Divine, and Todd Oliver is a ventriloquist act who uses a live dog as his puppet, working its fake lower jaw. Light Wire Theater Company and the Aurora Light Painters use differing methods to make animated collages come to life on stage.

- Andrew De Leon featured in the classical singers group along with Simply Sergio, who was struggling with a sore throat. Sergio almost made it through "O Sole Mio" but forgot the words. Luis Meneghin turned up in full evening attire but he misfired on some of his notes. Then it was Andrew's turn. He was dressed in his now-familiar "Goth" style. Singing falsetto, the 19-year-old also lost his place and forgot lyrics. The broadcast ended with the judges discussing if they should be lenient and forgive any of the singers' failings. We'll have to wait for their verdict.

"America's Got Talent" continues Tuesday at 9:00 p.m. Eastern time on NBC.