The Recombination Hypothesis is the 13th episode of the 5th season of The Big Bang Theory. In this episode Leonard asks Penny out on a spur-of-the-moment romantic dinner for two, as they contemplate renewing their relationship after there breakup.
- All Just a Dream: Turns out the entire episode is an extended Imagine Spot where Leonard asks Penny out again but they start bickering and covering up their problems with sex. Just before being snapped out of his dream. Penny tells him that he always overthinks things, and the first thing he does exiting the dream is ask her out despite the "Bad Ending" he conceived. Penny even asks if he thought this through and he replies with an exasperated nod "Yes, and I think we should go, anyways."
- Big Damn Kiss: Penny gives one to Leonard before having sex with him, turns out it was All Just a Dream.
- Daydream Surprise:
- Fanservice Costumes: For there dream date, Penny initially tries on a sexy green dress, which Bernadette feels is too much but Amy loves.
- Innocent Innuendo: Sheldon when playing a board game with Howard and Raj, much to their amusement.Sheldon: And now that I have my wood, I'm going to begin the erection of my settlement.
Raj: He's got to be doing this on purpose.
- Insult Backfire: Howard tries to insult Leonard over coming back early from his bad date. Leonard just retorts" You're thirty years old and you live with you're mother" which immediately shuts Howard up.
- Longing Look: Penny gives one to Leonard at the start of the episode when smiling at him.
- Relationship Revolving Door: After breaking up and agonising over there feeling for each other throughout Season 4, Leonard and Penny finally begin dating again.
- Sheldon ordered a cardboard cutout of Mr. Spock, but is disappointed that it's the movie reboot version rather than the original.Sheldon: Live long and suck it, Zachary Quinto!
- The guys are playing Settlers of Catan. The episode gets a lot of laugh mileage out of the game's memetic "wood for sheep".
- On his date with Penny, Leonard mentions that he used his grant money to build his own Bat-Signal.
- Sheldon ordered a cardboard cutout of Mr. Spock, but is disappointed that it's the movie reboot version rather than the original.
- When She Smiles: Two examples.
- Penny just smiles when she sees Leonard at the start of the episode, it shows she still cares about him a lot and is happy to see him.
- The next one happens after Leonard finally asks Penny out, it's the first time Penny has been happy in a year when Leonard asks her out again.