The Big Bang Theory, Season 12

Leonard:
Can't believe it. Sheldon loves telling on people when they break the rules.

Penny:
Yeah, well, maybe, he's changed.

Leonard:
He hasn't changed. Last week when the vending machine gave me two bags of chips he called my mom.

Penny:
Well, that didn't ruin your life.

Leonard:
Well, it ruined my day. And I had to talk to my mom, who by the way is polyamorous now. So that's fun to think about.

Penny:
Look, I'm proud of Sheldon and Amy. You know, they want to win on their own merits, not by knocking out the competition.

Leonard:
Yeah, but what if they don't win. Pemberton and Campbell have done an amazing job associating their names with super-asymmetry. They have all the momentum right now.

Penny:
I don't like the idea of them losing either, but this is their decision to make, not ours.

Leonard:
Maybe it is ours.

Penny:
What do you mean?

Leonard:
Well, if Sheldon and Amy don't want to expose Pemberton, that doesn't meant that someone else can't do it for them. They never have to know.

Penny:
Really? You'd do that?

Leonard:
They deserve the Nobel. I’m not gonna let two frauds steal it from them. And if it means getting my hands dirty, then so be it. [Penny laughs.] What's so funny?

Penny:
Just realized I've never actually seen your hands dirty.