The premiere of "America's Got Talent" hit a ratings high point last night -- but two of the wannabe contestants hit record lows ... when they both fell off the stage!

First up was a man named Primitivo Montoya, a waste water management worker from Denver who ended his pop-and-lock routine by doing a cartwheel right off the stage!

The judges were shocked ... but didn't give him any sympathy votes. Primitivo quickly got the boot.

The second fall guy last night was a weird freestyle rapper named Metatron, AKA the Angel of Light, who simply walked right off the stage. Yeah ... he didn't make it either.

The premiere episode was reportedly up 17 percent from last summer’s debut.

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