The Big Bang Theory, Season 6

Sheldon:
You can't live here.

Amy:
What? Why? Is it the {answering machine} message? I only used urban slang to sound tough so people wouldn't break in.

Sheldon:
It's not the message.

Amy:
What is it then? I did everything just the way you like it.

Sheldon:
You did.

Amy:
THEN WHAT THE HELL SHELDON!?!? We have been going out for over two years and I have been nothing but patient with you. I watch your dopey space movies. I signed your ridiculous contract. I even stopped wearing lip gloss because you said it made my mouth look too slippery. I am the best girlfriend you're ever going to have. Just give me one good reason why I can't live here.

Sheldon:
It's Penny's fault.

Amy:
What?

Sheldon:
She doesn't want to live with Leonard so he has to live here again. She's the snake in our garden. She's the reason we can't be happy.