According to Jim

Vegas, Baby (2) (2x28)

:

Andy is upset because no one approves or believes in his marriage to Roxanne. Jim goes to talk to her and walks in on her packing to run off with her ex boyfriend. He tries to stop her, unsuccessfully. Jim and Cheryl try to break the news to Andy before the business presentation, but he's so upset that he breaks down in tears on stage. While consoling Andy, Jim forgets about the foam hose and foam just floods the stage. Jim and Cheryl stroll in Las Vegas, glad that Andy is finally recovering from Roxanne and glad that their trip is over.