What's this from?

Okay, my brother and I can't figure this one out.

What movie is it where a guy, or possibly a kid, is like, maybe hiding in a room or behind a curtain or on the other side of a wall, and there's another guy on the other side of the wall or in the other room or on the other side of the curtain and he thinks the first guy is something like his wife or girlfriend or some kind of woman, so the first guy can't talk, or he'll be found out, and we don't really know why he's hiding, but anyway the second guy is asking the first guy if everything is okay, and the first guy (or kid) is like "mmmHmmm" in a really high-pitched tone, and then the second guy says something maybe like "Do you need any help?" or "Why don't you come out of there?" or some kind of question, I can't be sure what, and the first guy uses his high-pithed voice again and goes, "unhUhhh" (you know, like "no way")?

We don't remember the setting, the characters, the plot, or the dialogue, but we know it exists.

Little help?