In case you missed it, there’s a Tonight Show prank that’s gone viral that you’ve just gotta see. As part of the show’s Pumpcast News prank series, unsuspecting couples at the gas pump are given the opportunity to win free gas. This week, when married couple Will and Monif Sims was caught on camera in Burbank, California, what ensued was both sweet and hilarious. (And, total viral video magic!) Watch as Will, a bartender, joyfully sings Bon Jovi’s “Living On a Prayer” and then joins his wife Monif, a fitness instructor, for a gleeful, duet on her rendition of the Eurythmics “Sweet Dreams” to earn their free tank. There’s no way this video won’t make you smile this morning!