Here you are.
3 seconds sound clip from the The Seven Year Itch (1952) movie soundboard.
You can hear this line at 00:38:25 in the Blu-ray version of the movie.
Quote context
[...]
- But thank goodness there was a phone in the bathroom, so I was able to call the plumber.
- Did everything come out all right?
- Oh, sure. But it was sort of embarrassing.
- Yeah. I can see how it might have been.
- Honestly, I almost died. There I was with a perfectly strange plumber, and no polish on my toenails.
- A cigarette? Cigarette? Oh, sure. Coming up.
- Are you afraid of burglars or something?
- Of course, it's not one hundred percent foolproof. It's only a theory. There are certain flaws.
- Actually, the whole thing is just ridiculous.
[...]