The 15th episode of Season 1 of Young Sheldon.
Sheldon develops an interest in geology and earth sciences when he begins a crush on a rock enthusiast female student named Libby.
- Did Not Get the Girl: Sheldon breaks up with Libby, while Tam attempts but fails to date her.
- Dramatic Irony: Both Sheldon and Tam fall in love with Libby, but they don't know they're both in love with her. Tam did say so, but Sheldon didn't listen.
- Hypocritical Humor: Georgie calls out George for spying on Sheldon and calls that creepy. When Georgie himself is spying on George, prompting the latter to tell him to go away.
- Insistent Terminology: Sheldon does not like being called a kid, he prefers "young adult". He finds the term "kid" to be an insult to his intellect.
- Love Triangle: Sheldon and Tam fall in love with Libby, but neither of their crushes on Libby work out when:
- On their way to see the IMAX movie about rock geology somewhere in Houston, Texas, Mary expresses concern over Sheldon being driven on a one-hour ride without his parents. Libby tells Mary that she has a lot of experience in babysitting kids. When Sheldon hears the words "Babysitting", he runs off to his room distraught that Libby only thinks of him as a juvenile and refuses to go to the movies, or have anything to do with her whatsoever.
- During the movie, Tam tries to put his arms around Libby to warm up to her. Libby abrasively rejects his advances, and so they separate.
- Minor Flaw, Major Breakup: Sheldon decides not to be with Libby anymore after she calls him a child whom she must babysit. He states this flaw is so traumatic he's decided not to even wait to ask out Libby when he gets older.
- Not Now, Kiddo: Applied to (guess who?) Missy of course. While Mary is consoling a heartbroken Sheldon when he finds that Libby isn't wanting to date him, Missy enters the room and tries to make the conversation about herself, but Mary shoos her out. Missy picks up her doll and leaves.
- Origins Episode: This episode explains why Sheldon hates geology so much and doesn't consider a real science anymore. It's that Libby called him a "kid" for her to babysit, which he took as an insult to his intellect.