The Big Bang Theory, Season 2

Sheldon:
Leonard, you have to do something about Penny. She's interfering with my sleep, she's interfering with my work...and if I had another significant aspect of my life, I'm sure she'd be interfering with that, too.

Leonard:
Why should I do something? You're the one who introduced her to online gaming.

Sheldon:
Yes, but you're the one who said hello to her when she moved in. If you'd simply restrained yourself, none of this would be happening.

Leonard:
Why don't you just tell her to leave you alone?

Sheldon:
I did! I told her, I texted her, I sent out a very emphatic Twitter, I even changed my Facebook status to "Sheldon Cooper wishes Penny would leave him alone"! I don't know what else to do!

Leonard:
Well, what am I supposed to do?

Sheldon:
I don't know, but if you don't figure something out, I warn you, I shall become very difficult to live with!

Leonard:
You mean up until now we've been experiencing the happy, fun-time Sheldon?

Sheldon:
Yes.

Leonard:
I'll go talk to her!