Leonard and Penny try to sort out their relationship status. Sheldon, Howard, and Raj hear a cricket in the apartment and a challenge ensues.
- The Bet: Sheldon and Howard argue over whether a cricket in the apartment is either a common field cricket or a snowy tree cricket. Eventually, they make a bet over who is right; the loser gives the winner a prized comic book from their collection. After consulting the university's entomologist Prof. Crawley, Howard wins the bet.
- Comically Missing the Point: When Penny tries to empathize with Sheldon's wager loss, and he doesn't understand why that should make him feel better.
- Continuity Nod: Sheldon mentions the twin sister he used to fight with, whom we met last season.
- Don't Explain the Joke: Sheldon tells Raj that, given his fear of both women and bugs, ladybugs must paralyze him. When Raj stares at him, Sheldon explains the joke, and it's even less funny.
- Grumpy Bear: Professor Crawley, as played by Lewis Black.
- Humiliating Wager: A mild example. While Sheldon is upset about losing his comic book, it's worse that he loses to Wolowitz.
- Inherently Funny Words: Penny buys peppermint schnapps simply because she likes to say "schnapps".
- Meaningful Name: Professor Crawley is an apt name for an entomologist (one who studies insects), as he himself notes.
- Pest Episode: The B plot has Sheldon, Howard and Raj trying to catch a cricket loose in Sheldon and Leonard's apartment.
- Relationship Upgrade : Leonard and Penny.
- Shiksa Goddess: Howard tries to explain the concept to Raj.Howard: A shiksa goddess isn't an actual goddess. You don't pray to them, you prey on them.
- Sophisticated as Hell: When Howard looks up the cricket on a book, this exchange occurs.Howard: There we are, the common field cricket. Gryllus assimilis, which is Latin for "Suck it, you lose!"
Sheldon: Hang on. [flips through book] Voila! The snowy tree cricket. AKA, Oceanthus fultoni, which is Latin for "I'll suck nothing!" Of course I'm joking, because the Latin for that is "Nihil exsorbibo".
- Vomit Chain Reaction: Leonard is puking on the toilet after drinking too much. Penny peeks inside and starts throwing up on the sink. Then Leonard sees her and heads back to the toilet.