You can't be too careful when it involves underwear.

5 seconds sound clip from the Home Alone 2: Lost in New York movie soundboard.

You can hear this line at 00:40:23 in the Blu-ray version of the movie.

Quote context

[...]

- Good night, Mom.

- Good night, Kevin.

- Your drawers, sir.

- Jeez! Don't flash these babies around here! There could be girls on this floor!

- I was very careful, sir.

- You can't be too careful when it involves underwear.

- I understand.

- I'm sorry. You wanted a tip.

- That won't be necessary, sir. I still have some tip left over.

- No tip? Okay.

[...]