That must be what he was doing in the cellar last night: placing one of these. I'm sorry.

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

You can hear this line at 00:42:10.058 in the Blu-ray version of the movie.

Quote context

[...]

- No, wait!

- I'm sorry, but I take a dim view of watching my own destruction take place.

- There isn't any danger until they're completely formed. We learned that last night at your house.

- Your blank didn't change right away.

- Not until you fell asleep.

- When the change does take place do you suppose there's any difference?

- There must be.

- Wilma noticed it.

- So did little Jimmy.

- So did I. My father.

- That must be what he was doing in the cellar last night: placing one of these. I'm sorry.

- I felt something wrong, but I thought it was me because I'd been away for so long.

- They have to be destroyed. All of them.

- They will be. Every one of them.

- Listen we're gonna have to search every building, every house in town. Men, women, and children are gonna have to be examined. We've got some phoning to do.

- I'm going to stay right here where I can watch them.

- I will stay with you.

[...]