Nicki Minaj Flawless September 19, 2014

In September 2014, Nicki Minaj swept through Las Vegas for a quick iHeartRadio Festival performance that included the live debut of her stunning "Flawless" remix verse. About halfway through, someone working the decks messed up the song's instrumental, and it abruptly cut out. "Do we have a problem, iHeart?" Nicki asked with a giggle, adding quickly, "because I can rap it a cappella." And oh, how she rapped it a cappella. Her tongue flies faster than the human brain can understand as she bodies her final verses on the track. It's a feat that needs to be seen.