Amy Adams Singing: Watch Actress & Jimmy Fallon Perform Hilarious 'Grease' Duet [VIDEO]

You will never think of Rihanna's "Work," Justin Bieber's "Sorry," or "You're the One That I Want" from Grease the same way again.

Thanks to Jimmy Fallon's new "Box of Microphones" game on The Tonight Show, which he debuted while hosting Amy Adams as his guest, these songs will forever be playing in your mind now in a loop of sound effects--instead of with the original singers' voices.