In the most recent episode of The Late Late Show with James Corden, the Jonas Brothers joined James Corden in Carpool Karaoke. Not only do the Jonas Brothers sing some of they're throwback songs like "Year 3000" and "Burning Up," but they talk about some of the things that played a part in them breaking up and then reuniting again. But that's not all, James Corden then surprises them with a lie detector test! See the video below.