The Big Bang Theory, Season 6

Leonard:
Anyway, Stephen Hawking's team is looking into that and I've been invited to join them.

Penny:
Wow Hawking, good for you!

Leonard:
Well it is. Just...you know I'd be gone for a while.

Penny:
For how long.

Leonard:
Three - four months.

Penny:
Whoa. When would you leave?

Leonard:
A couple weeks.

Penny:
Wow. OK. Well, I'll just come visit you.

Leonard:
That's the thing. You can't. I'll be on a ship in the North Sea.

Penny:
On a ship? Aren't they afraid Hawking will just roll overboard?

Leonard:
He's not going to be there. He's just sending a team to research his theory.

Penny:
Oh sure. Like when you send me to kill spiders in your bathtub. Well, OK. Four months.

Leonard:
Yeah, I'm a little worried because things between us have been so great. And I'd hate to do anything to screw that up.

Penny:
Oh, sweetie. If you're going to do anything to screw things up, it's going to be while you're here, not while you're away.