Where is this quote from?

[mrpants]

I've had this quote in my head all morning and it's silly I know, but it's driving me mad that I can't remember where it is from.

It goes like this, "they didn't notice anything, and they were really looking". It might not be the exact quote, and I can't remember the exact context, probably involving something embarrassing and someone trying to calm that person's anxiety. It's probably from a sitcom, I'm thinking Friends or The Office.

Usually google is pretty good at finding song lyrics (or in this case, tv/movie) but it's come up blank.

Normally I wouldn't waste people's time with such nonsense and little payoff, but I won't get a thing done today until I know