Not just a Robin Williams movie. Every character contributes energy and humor to a dynamic comedic energy that has editing and camera shots that just well.... keep the whole thing moving in such a funny way. Everyone plays their characters magnificently and the zaniness of the interaction does not become too much to enjoy given it is generated by characters depicted with internal dynamic that informs and drives the comedy, parody, and just a bit of heart. There is something endearing about Sheldon and his songs... and remember "Your step dads not mad he's just adjusting."