On this week’s Big Bang Theory, Leonard talks Penny into picking his mom, Beverly, up at the airport so he can avoid an awkward 40 minute ride where he will inevitably be insulted. She reluctantly agrees.
Not long after Penny picks up Beverly, she starts talking about his intimacy issues. Penny tries to divert the conversation. She ends up inviting her to dinner with her and the girls.
Meanwhile, the guys decide to go to a special Avengers screening and Q&A, but Sheldon is unable to attend because he promised Amy he would go shopping with her. They anticipate they will have to wait in a long line. They offer to save Sheldon a spot, but he thinks that would be cutting. Howard tells him that there are apps where he can hire someone to wait in line for him. Instead, he decides to pay Stuart to go shopping with Amy.
When Amy finds out what Sheldon did, she pays Stuart to go yell at Sheldon for being inconsiderate. Amy joins the girls and ends up bonding with Leonard’s mom, discussing his lack of communication and intimacy. She then talks to Bernadette about her job. This makes Penny feel jealous.
They get interrupted when Stuart shows up at the door with flowers saying that Sheldon says he is sorry. When this doesn’t go over well, Stuart offers to hold Sheldon’s place in line, for more money of course, so he can go apologize himself. Sheldon runs over and gives the best apology Sheldon is capable of giving before running back to the line.
Penny’s jealousy gets worse when Beverley asks Amy and Bernadette if she can interview them as well as Sheldon and Howard for her book on high achieving couples. This sets Penny off. She accuses Beverly of insulting her. Beverly snaps back arguing that she and Leonard got married without inviting her or telling her about it. Penny apologizes, saying she didn’t realize it meant that much to her. She tells her that they can have another small ceremony before she goes back home so she can come.
Back at the theatre, a guy cuts in front of the gang to join his friends. This upsets Sheldon saying that it is a breech of line etiquette Leonard tells him to let it go, but Sheldon refuses. Sheldon makes a scene and gets accused of cutting the line himself. He points out that what he did was line swapping, not cutting. Sheldon loses the battle and he is forced to go in to see the movie with the line-cutter.