The Big Bang Theory, Season 6

[Penny is performing on stage in A Streetcar Named Desire as Blanche DuBois]

Penny:
You love her very much. Don't you?

Tom:
Yes.

Penny:
You think you have great capacity for devotion. You'll be lonely when she passes on, won't you? I understand about it.

Tom:
You lonely?

Leonard:
She's good, huh?

Sheldon:
She is, but when do we get to the part about the streetcars?

Penny:
When I was a very young girl. When I was sixteen years old I made the discovery. Love. All at once much, much too completely. Like you suddenly turned a blinding light on something had always been half a shadow. That's how it struck the world for me. Then I was unlucky to lose it.

Sheldon:
She's remarkable.

Leonard:
She really is.

Amy:
Our Penny's a star.

Sheldon:
How can she remember all those lines, but as a waitress she can't remember "no tomato" on my hamburger?