(Sheldon hits him) Ow! Amy: Glad to hear it. Bernadette: That's pretty big talk for a man with a closet full of magic tricks at his mother's house. Bernadette: What are you going to get at the train store, Sheldon? Howard: And we have splashdown. Howard: Don't listen to her. Howard: Sure she would. It was billed as a lively give-and-take on the merits of model train sizes. Leonard: Okay. No date to the prom, two dates to a wedding. She is not for you. Sheldon is playing with his train set. They're having a lecture.
Plan: A: the model train store; Q: Where does Sheldon go to hear a lecture on model trains? A: an HO gauge model train set; Q: What does Sheldon buy after hearing a lecture on model trains? A: Amy; Q: Who decides to take Leonard to a wedding for two scientists? A: her date; Q: What does Amy decide to take Leonard instead of Sheldon to a wedding for two scientists? A: Howard; Q: Who asks Bernadette to stay with him and his mother for the weekend as a "trial"? A: a snag; Q: What does Howard and Bernadette's relationship hit when Bernadette tells Howard that she would not move in with him and his mother after they get married? Summary: Sheldon goes to the model train store to hear a lecture on model trains, and is convinced into buying an HO gauge model train set. Amy decides to take Leonard instead of Sheldon as her date to a wedding for two scientists. Meanwhile, Howard and Bernadette's relationship hits a snag when Bernadette tells Howard that she would not move in with him and his mother after they get married. Howard asks her to stay with him and his mother for the weekend as a "trial", to which she agrees.