We've all been at gigs where the singer takes a generous turn and offers the microphone to an audience member for a line or two.
More often than not, however, it turns out to be a disastrous move by the performer because the fan in question sounds like a bag of cats fighting. Not Rihanna fans, though.
The star handed her mic to an audience member called Terah Jay who was in the front row at her Cincinnati gig on Saturday night, and let's just say that she got more than she bargained for.
The expression on her face as he sings a couple of lines from 'Four Five Seconds' is priceless.
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Watch it below: