When Jimmy Fallon booked Mariah Carey for his show, he wanted to do a little something special for her Lambily (also known as "Mariah Carey fans"). 

Fallon told a small group of lucky superfans to come by for an exclusive listen of Mariah's new single, "The Art of Letting Go." Their reactions to the song itself are enough to make you LOL, but once Mariah comes out, mass hysteria everywhere—laughing, crying and genuine shock. No really, shock that probably needs medical attention. 

Check out the hilarious fan surprises above.