Ah, look, Mom, you don't understand.
3 seconds sound clip from the Criss Cross (1949) movie soundboard.
You can hear this line at 00:33:47.534 in the DVD version of the movie.
Quote context
[...]
- If I wasn't your mother, I wouldn't worry.
- She's all right. She's just young.
- In some ways, she knows more than Einstein.
- You sit around watching me like I was a 10-year-old kid.
- How old do you think you are?
- I've voted for two presidents already.
- Ah, look, Mom, you don't understand.
- What makes you think I don't understand? I understand.
- You don't know anything about her.
- You had trouble with her once, didn't you?
- All right. Let's forget it. There's nothing you can do anyway.
- Nothing?
[...]