Helen, I can explain everything: the cinnamon toast, the shower, everything.
6 seconds sound clip from the The Seven Year Itch (1952) movie soundboard.
You can hear this line at 01:33:03 in the Blu-ray version of the movie.
Quote context
[...]
- No, no, Helen. It's not true.
- Don't lie to me, Richard. Don't lie to me.
- Who told you? How did you know?
- I'm going to shoot you dead.
- Helen, I can explain everything: the cinnamon toast, the shower, everything.
- You see, this girl's from Denver.
- Not only that, but the drugstore wouldn't take back the little fan because she lost the sales slip.
- So I let her sleep in our bed because it's too hot up there.
[...]