Priya: Listen, Rajesh, Leonard and I have decided to see each other again, and you don't get to tell me who I can and can't have a relationship with.
Sheldon: Actually, he can. The Hindu Code of Manu is very clear in these matters. If a woman's father is not around, the duty of controlling her base desires falls to the closest male member of her family, in this case, Raj. The code also states that if she disobeys, she will be reborn "in the womb of a jackal and tormented by diseases." If true, that seems like an awfully large gamble given that the prize is Leonard.
Rajesh: There it is, Priya. We're Indian. We believe this stuff.
Priya: I think it also says that if you eat beef, you need to live with cows for three months and drink their urine.
Rajesh: Some of it makes sense, some of it's crazy.

Penny: Really, I am not upset about Leonard and Priya.
Amy: Oh. Then perhaps you don't understand what's going on. Your former boyfriend has replaced you with what appears to be a very suitable mate. Arguably much more suitable than you.
Penny: Oh. Well, good for him. Hey, what do you mean, "more suitable"?
Amy: Well, granted, Penny, your secondary sexual characteristics are reasonably bodacious. But Priya is highly educated, she's an accomplished professional, and she comes from the culture that literally wrote the book on neat ways to have sex. Whereas you, on the other hand, are a community college dropout who comes from the culture that wrote the book on tipping cows.

Penny: Ooh, I thought I smelled pizza.
Sheldon: That's remarkable. If pepperoni were an explosive substance, you could replace German shepherds at our nation's airports.