Me? Who are you?
3 seconds sound clip from the A King in New York (1957) movie soundboard.
You can hear this line at 01:13:55 in the Blu-ray version of the movie.
Quote context
[...]
- There's a strange kid in that apartment. I've never seen him before.
- I'm the house detective. What are you doing here?
- Waiting.
- Hi, Uncle. This is the house detective.
- Pardon me, Sir. I didn't realize the young man was your nephew. Just checking up.
[...]