It's not true but it proves my point

An alien spaceship lands on Earth.

After several failed attempts to communicate, the first contact team's linguist, Louise Banks, brings a whiteboard to the next encounter.

She writes "HUMAN" on the whiteboard.

The aliens finally respond by projecting strange circular symbols into the air.

Afterwards...

COLONEL WEBER: I don't want to take away from your success in there. But Dr. Banks, is this really the right approach? Trying to teach them how to speak and read? That's got to take longer.

LOUISE: You're wrong. It's faster.

COLONEL WEBER: Everything you do in there, I have to explain to a room full of men who first and last question is..."How can this be used against us?". So you're gonna have to give me more that that.

LOUISE: Kangaroo.

COLONEL WEBER: What is that?

LOUISE: In 1770, Captain James Cook's ship ran aground off the coast of Australia. He led a party into the country, and he met the Aboriginal people. One of the sailors pointed at the animals that hop around and put their babies in their pouch, and he asked what they were, and the aborigine said, "Kangaroo".

COLONEL WEBER: And the point is?

LOUISE: It wasn't till later that they learned that kangaroo means "I don't understand". So I need this so that we don't misinterpret things in there. Otherwise, this is going to take ten times as long.

COLONEL WEBER: I can sell that for now. But I need you to submit your vocabulary words before the next session.

LOUISE: Fair.

COLONEL WEBER: And remember what happened to the Aborigines. A more advanced race nearly wiped them out.

• The Colonel leaves the room *

IAN: It's a good story.

LOUISE: Thanks.

It's not true.

But it proves my point.