Now, who could've tipped her off? Kruhulik, that's who!
5 seconds sound clip from the The Seven Year Itch (1952) movie soundboard.
You can hear this line at 01:32:08 in the Blu-ray version of the movie.
Quote context
[...]
- Boy, if anybody were to walk in here right now, would they ever get the wrong idea.
- Helen. She's in Maine. How could she get here? On the train. That's how. On the early-morning train.
- Now, who could've tipped her off? Kruhulik, that's who!
- There's a woman in this apartment. I just know there is.
[...]