Not too fast. It makes it look suspicious.

3 seconds sound clip from the Boogie Nights (1997) movie soundboard.

You can hear this line at 02:07:37.650 in the Blu-ray version of the movie.

Quote context

[...]

- You guys ready for this?

- I am.

- Dirk?

- Me? Yeah, yeah. I was born ready, man.

- What the fuck is that, Todd?

- It's a big gun.

- No shit, but why?

- Just in case.

- Shit. Fucking great. What the fuck is the matter with you? You never said anything about an fucking gun.

- Now I'm getting fucking nervous. Do you have a gun too?

- No, I don't have a gun. He never said...

- Shh. Relax. Let's just get in and out, all right? In, out.

- Not too fast. It makes it look suspicious.

- Just let me do all the talking, all right?

- Just be cool.

- How you doing? Come on in.

- Hello, friends.

- Which one is Todd?

- Yeah, that's me.

[...]