Friends, Season 6

Monica:
You wanted it to be a surprise.

Chandler:
Oh my...

Monica:
Chandler... in all my life I never thought I'd be so lucky as to fall in love with my best - my best - There's a reason why girls don't do this!

Chandler:
Okay, okay, I'll do it. I thought: wait, I can do this. I thought that it mattered what I said or where I said it. Then I realized the only thing that matters is that is that you - you make me happier than I ever thought I could be. And if you let me, I will spend the rest of my life trying to make you feel the same way. Monica, will you marry me?

Monica:
Yes! I knew you were likely to take a wife!

Joey:
Can we come in yet? We're dying out here!

Monica:
Come in! Come in! We're engaged!

Joey:
Yeah, you are!