The cast of Schitt's Creek reunited for YouTube's Dear Class of 2020 commencement event and had a spectacularly special moment with the one and only Mariah Carey. 

The clip opens with Johnny, Moira, David, and Alexis thanking the Obamas for leading the ceremony. Moira hilariously corrects her family with her endless supply of SAT words before introducing the Jazzagals, Stevie Budd, and Ray who have gathered to sing "Hero" by Mariah Carey, led by Patrick, and dedicated to the teachers and professors of the world.

At the very end, Carey herself pops in to finish off the number! 

"Moira darling, I hope you didn't mind that I jumped in like that," she says, hair blowing in the wind even while sitting on her couch. "You all sounded so good that I had to jump in on it. "

"I think I'm having a heart attack," cries a shocked David. 

Watch the hilarious sketch below!