The Big Bang Theory Season 5 Episode 20

Sheldon: I opened your toy… discovered it was broken, and didn't tell you.
Leonard: Why would you open mine?
Sheldon: I didn't. That was a lie. I opened my own toy… and it was already broken, so I switched them.
Leonard: Then you should talk to Stuart.
Sheldon: I can't, because that was a lie. Yours… was broken in an earthquake, and that's a lie.
Penny: What is the truth?
Sheldon: My Mr. Spock doll came to me in a dream and forced me to open it, and when the toy broke, I switched it for yours. Later, he encouraged me to do the right thing and I defied him, then I was attacked by a Gorn.
Leonard: Okay, that I believe.

Penny: I got a little residual check from my commercial, and I thought, hey, how about I get the guys a little thank you to pay them back? So, Sheldon… (pulls toy out of bag) ta-daa!
Sheldon: (gasps) A vintage mint-in-box 1975 Mego Star Trek Transporter with real transporter action! Hotdarn!
Leonard: (awestruck) Where did you get that?
Penny: That's from Stuart at the comic book store.
Leonard: You went to the comic book store by yourself?
Penny: Yeah, it was fun. I walked in and two different guys got asthma attacks. Felt pretty good.

Sheldon: This calls for an expression of gratitude.
Penny: Ooooh, am I about to get a rare Sheldon Cooper hug?
Sheldon: No, not this time; then they wouldn't be special. (points fingers like a gun and makes a clicking sound) Thanks, Penny!