It came to me when I tried to classify your species and I realized that you're not actually mammals.

Agent Smith (Hugo Weaving)

11 seconds sound clip from the The Matrix movie soundboard.

You can hear this line at 01:37:40 in the Blu-ray version of the movie.

Quote context

[...]

- I believe Morpheus means more to me than he does to you.

- I believe if you are really serious about saving him, you are going to need my help.

- And since I am the ranking officer on this ship, if you don't like it, I believe you can go to hell. Because you aren't going anywhere else.

- Tank... load us up.

- I'd like to share a revelation that I've had during my time here.

- It came to me when I tried to classify your species and I realized that you're not actually mammals.

- Every mammal on this planet instinctively develops a natural equilibrium with the surrounding environment. But you humans do not.

- You move to an area and you multiply and multiply until every natural resource is consumed.

- The only way you can survive is to spread to another area.

- There is another organism on this planet that follows the same pattern. Do you know what it is? A virus.

[...]