Sheldon: Interesting. Sex works even better than chocolate to modify behavior. I wonder if anyone else has stumbled onto that.

Sheldon: You know, I've always wanted to go to a goth nightclub.
Howard: Really?
Sheldon: Bazinga! You never see any of my practical jokes coming, do you?

Leonard: I'm just saying, you catch more flies with honey than with vinegar.
Sheldon: You catch even more with manure, what's your point?

Sheldon: Penny, while I subscribe to the "Many Worlds" theory which posits the existence of an infinite number of Sheldons in an infinite number of universes, I assure you that in none of them am I dancing.
Penny: Are you fun in any of them?
Sheldon: The math would suggest that in a few I'm a clown made of candy. But I don't dance.

Leonard: I know what you're doing.
Sheldon: You do?
Leonard: You're using chocolate as a positive reinforcement for what you consider is a correct behavior!
Sheldon: Very good. Chocolate?

Sheldon: That does smell good, too bad it's Monday.

Leonard: Sheldon, you need to find a better way of dealing with Penny.
Sheldon: What am I supposed to do? Eat French Toast on a Monday? Now that would be impossible.

Sheldon: There are more things in Heaven and Earth, Horatio, than are dreamt of in your philosophy.

Penny: All right, want some French toast?
Sheldon: It's Oatmeal Day.
Penny: Tell you what, next French Toast Day, I will make you oatmeal.
Sheldon: Dear Lord, are you still going to be here on French Toast Day?

Sheldon: Look, Leonard, Penny made French toast.
Leonard: Sorry. I haven't given her your schedule yet.
Sheldon: It's an iCal download, she can put it right in her phone. And I thought we agreed that you'd have your conjugal visits in her apartment.
Leonard: We did, but there were extenuating circumstances.
Sheldon: I see. Did her abysmal housekeeping skills finally trump her perkiness?

Leonard: No, her bed kind of ... broke.
Sheldon: That doesn't seem likely. Her bed's of sturdy construction. Even the addition
of a second normal size human being wouldn't cause a structural failure, much less a homunculus such as yourself.
Penny: A homunculus?
Leonard: Perfectly formed miniature human being.

Penny: Okay, so Kim, the night manager, went on maternity leave, and her husband's name is Sandy, right? So get this, her replacement is a woman named Sandy whose husband's name is Kim.
Leonard: Wow!
Penny: I know. What are the odds?
Sheldon: Easily calculable. We begin by identifying the set of married couples with unisex names. We then eliminate those unqualified for restaurant work: the aged, the imprisoned and the limbless, for example. Next we look at-
Leonard: Sheldon! It's an amazing coincidence, can we leave it at that?
Sheldon: I'm sorry. Ooh, Penny, it's as if the Cheesecake Factory is run by witches.

Sheldon: There's just no pleasing you, is there, Leonard? You weren't happy with my previous approach to dealing with her, so I decided to employ operant conditioning techniques, building on the work of Thorndike and B.F. Skinner. By this time next week, I believe I can have her jumping out of a pool, balancing a beach ball on her nose.
Leonard: No, this has to stop now.
Sheldon: I'm not suggesting we really make her jump out of a pool. I thought the Bazinga! was implied.

Sheldon: I'm just tweaking her personality, sanding off the rough edges if you will.
Leonard: No, you're not sanding Penny.
Sheldon: Are you saying that I'm forbidden from applying a harmless, scientifically valid protocol that will make our lives better?
Leonard: Yes, you're forbidden.
Sheldon: (Squirts Leonard with a water spray) Bad Leonard!

Leonard: What could she possibly be talking about for so long?
Sheldon: Obviously, waitressing at the Cheesecake Factory is a complex socioeconomic activity, that requires a great deal of analysis and planning. Bazinga!