Would you sing karaoke at the gas pump, if it meant a tank of free gas? This couple sure did!

What I wouldn't give to have been a fly on the pump, as it were, so that I could have experienced this live! I love how outgoing the guy is in the video! He has no shame - even when he's just singing back-up for his lady. I also love how he breaks into improv lyrics for "Living on a Prayer," when he learns that he's going to get free gas. Take a look! I bet you can't keep from laughing! Kudos to the Tonight Show for pulling off this epic prank!