If it doesn't work, I don't know what will.

4 seconds sound clip from the The Thing from Another World movie soundboard.

You can hear this line at 00:48:48 in the Blu-ray version of the movie.

Quote context

[...]

- At 12:10 A.M., the hand became alive.

- The temperature of the forearm showed a 20-degree rise.

- Because of this rise in temperature, I believe it was able to ingest the canine blood with which it was covered.

- You mean it lives on blood.

- It's the best we could find, Pat.

- If it doesn't work, I don't know what will.

- Where are you going, captain?

- To find our visitor if we can.

- One moment, captain!

- Check the storeroom again. Bolt any outside doors.

- Captain, when you find what you're looking for, remember it's a stranger in a strange land. The only crimes involved were those committed against it.

[...]