Gas pump karaoke - watch this couple KILL IT

Next time we're having a party, we are SO inviting these two.

The Tonight Show with Jay Leno offers drivers the chance to win a free fill-up at the gas station - in exchange for a little karaoke.

These guys take up the challenge, and then some.

(TonightShowNBC via YouTube)

Take a bow, Will and Monifa Sims.

But wait! There's more!