During his hosting gig in Oct. 2012, Bruno Mars wowed viewers with a series of impressive sketch appearances, including ‘Haters,’ in which he convincingly played a bratty 17-year-old girl who screamed, “Y’all are just jealous because I’m young and I got a debit card and I know where the party at!”

But even more memorable was Bruno’s portrayal of a nerdy intern who came to life when Pandora’s Internet Radio service went down. Mars' mild-mannered character stepped up and provided all the vocals for songs by Justin Bieber, Green Day and Michael Jackson. He also put the “Ah! Ah! Ah!” in Katy Perry’s ‘Firework.’