the guy with him is supposed to be a fan who won a breakfast with Jo. He happens to be quite annoying.
He asks a autograph for his grand mother, but since the grand ma doesn't really know Jo, he asks him to sign as Guy Forget, he watchs and counts the croissants Jo is eating, saying he musn't eat that to much to be perfectly fit for RG, then he wants him to wear a shirt he made with his friend but it's a lady shirt in a very small size...
Jo is laughing and smiling but in the end you can see he is kind of bothered by this guy!
hope it will help you understand ( but it's not that funny anyway