Oh, no, that's all right, ma'am. I was just showing him a thing or two on the guitar here.

5 seconds sound clip from the Forrest Gump (1994) movie soundboard.

You can hear this line at 00:11:04 in the Blu-ray version of the movie.

Quote context

[...]

- Sometimes we had so many people staying with us that every room was filled with travelers.

- You know, folks living out of their suitcases and hat cases and sample cases.

- Forrest Gump, it's suppertime! Forrest...

- One time, a young man was staying with us, and he had him a guitar case.

- Forrest! I told you not to bother this nice young man.

- Oh, no, that's all right, ma'am. I was just showing him a thing or two on the guitar here.

- All right, but your supper's ready if y'all want to eat.

- Yeah, that sounds good. Thank you, ma'am.

- Say, man, show me that crazy little walk you just did there. Slow it down some.

- I liked that guitar. It sounded good. I started moving around to the music, swinging my hips.

[...]