You got both kneecaps?
3 seconds sound clip from the Uncle Buck (1989) movie soundboard.
You can hear this line at 00:51:27 in the Blu-ray version of the movie.
Quote context
[...]
- I like to carry it. You never know when you're gonna need it.
- I like to keep mine razor-sharp, too. Sharp enough you can shave with them.
- Why, I've been known to circumcise a gnat.
- You understand what I'm talking about? I don't think you do. I'll be right back.
[...]