- Can you make them believe you?
- I've got to.

3 seconds sound clip from the Invasion of the Body Snatchers (1956) movie soundboard.

You can hear this line at 00:43:07.510 in the Blu-ray version of the movie.

Quote context

[...]

- Nick Grivett didn't find any body on a burning haystack.

- Why don't you call Danny? Maybe he can help.

- Danny? No, I'm afraid it's too late to call Danny, too.

- Well, what are you gonna do?

- Get help.

- I hope whatever's taking place is confined to Santa Mira.

- Operator.

- Hello, this is Dr. Bennell. This is an emergency. I wanna talk to the Federal Bureau of Investigation in Los Angeles.

- Can you make them believe you?

- I've got to.

- Where did they come from?

- So much has been discovered these past few years, that anything is possible.

- Maybe the results of atomic radiation on plant life or animal life. Some weird alien organism, a mutation of some kind.

- Why should they take the form of people, of us?

- I don't know, I don't know.

[...]