It was Kanye West's worst nightmare ... taking the stage in front of thousands ... not being able to rant or even rap.
A$AP Rocky brought Kanye up on stage Friday night as the big surprise, but Yeezy's mic malfunctioned. You hear A$AP and backup music but no Kanye.
We're told A$AP got super pissed and after the video ends, he tossed his mic.
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