Of course, it's not one hundred percent foolproof. It's only a theory. There are certain flaws.
6 seconds sound clip from the The Seven Year Itch (1952) movie soundboard.
You can hear this line at 00:38:39 in the Blu-ray version of the movie.
Quote context
[...]
- 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.
- This club I lived at before I moved in here. I hated it.
- You had to be in by 1:00, or they locked the doors. Now I can stay out all night if I want to.
[...]