S14E19: The Blame Game and Airplanes

The Blame Game: After Marcos accidently breaks Melanie's project, he's afraid that she would not be his friend anymore. Barney teaches him that good friends are always honest to each other! Airplanes: BJ has fun with his toy airplane. But when Riff's curiousity causes him to mess up BJ's toy, can BJ put it back together?