I think I know exactly what you mean. You do?
7 seconds sound clip from the Back to the Future movie soundboard.
You can hear this line at 01:19:16 in the Blu-ray version of the movie.
Quote context
[...]
- We're going to take a little break, but we'll be back in a while, so don't nobody go nowhere.
- Marty? Why are you so nervous?
- You mean like how you're supposed to act on a first date?
- Sort of.
- I think I know exactly what you mean. You do?
- You know what I do in those situations?
- What?
- This is all wrong. I don't know what it is. But when I kiss you, it's like I'm kissing my brother.
- I guess that doesn't make any sense, does it?
- Believe me, it makes perfect sense.
[...]