The Big Bang Theory, Season 2

[Penny knocks on the door]

Penny:
Merry Christmas!

Leonard:
Merry Christmas!

Penny:
How's your leg?

Leonard:
Very good. Thanks for asking. Come on in.

Sheldon:
Oh, good, Penny, you're here to exchange gifts. You'll be pleased to know that I'm prepared for whatever you have to offer.

Penny:
[handing Sheldon his present] Okay, here.

Sheldon:
Hmmm. [starts to open his present] I should note, I'm having some digestive distress, [Leonard shakes his head no] so if I excuse myself abruptly, don't be alarmed. [completes opening his present] Oh! A napkin.

Penny:
Turn it over!

Sheldon:
[becomes weak at the knees and has to sit down as he reads] "To Sheldon. Live long and prosper... Leonard Nimoy."

Penny:
Yeah, he came into the restaurant. Sorry the napkin's dirty, he wiped his mouth with it.

Sheldon:
[gasps] I possess the DNA of Leonard Nimoy?!

Penny:
Well... [looks toward Leonard then back to Sheldon] yeah, I guess. But look, he signed it!

Sheldon:
[visibly shaking] Do you realize what this means?!?! All I need is a healthy ovum and I can grow my own Leonard Nimoy!!

Penny:
Okay, all I'm giving you is the napkin, Sheldon.