Sheldon: You keep in mind that my sharply-worded comments on Yelp.com recently took down a muffin store.

Sheldon: When was the last time you had your menstrual cycle?
Penny: Oh, I'm not answering that Sheldon.
Sheldon: I'm going to say in progress.

Sheldon: Let it never be said that Sheldon Lee Cooper ignored the pleas of a damsel in distress.

Penny: Sing Soft Kitty to me.
Sheldon: Soft Kitty is for when you’re sick. You're not sick.
Penny: Injured and drugged is a kind of sick.
Sheldon: [sings] Soft kitty, warm kitty, little ball of fur…
Penny: Wait, wait. Let's sing it as a round. I'll start. [sings] Soft kitty, warm kitty, little ball of fur… See that's where you come in. I'll start over. [sings] Soft kitty, warm kitty, little ball of fur… I've got all night, Sheldon. Soft kitty, warm kitty…
Both: [sing] ...little ball of fur, happy kitty, sleepy kitty, purr, purr, purr.

Raj: I know they're poison, but they look like big, yummy otter pops.

Raj: One day, I hold a great ball for the President of France, but the rabbits, they hate me and don't come. I'm embarrassed, so I eat all the lettuce in the world and make them watch.