Leno was so impressed by their performance that he invited them to the show.
The couple stopped at a gas pump where the "Tonight Show" had planted a camera.
The video shows Will Sims singing while he fills his car. An anchor on the TV screen above the pump tells him he is on "Pumpcast News" and that he will get free gas if he performs a song.
Will is surprised at first, but then he recovers. He offers to sing Bon Jovi's "Living on a Prayer."
The anchor offers to supply the lyrics so he can sing the entire song. But Will answers "No, I know them baby."
He begins singing while his wife bursts into uncontrollable laughter in the car. The anchor then asks him if he wants to do a duet with his wife. He says no. After he finishes the song the anchor tells him he is "living on a free tank of gas," and Will sings, "About to pump it up. Living for the gas."
His wife eventually gets out of the car to do a duet with him. She sings Eurythmics' "Sweet Dreams." Will and Monifa are delightful to listen to.
Leno was so impressed by the performance of the couple that he invited them on the "Tonight Show."
Leno said the two were "so entertaining and it was so nice to see a happy couple."