Groot: I am Groot.

Rocket: Tinkle in the cup. We're not looking. What's there to see? What's a twig? Everybody's seen a twig.

Groot: I am Groot!

Thor: Tree, pour what's in the cup out into space and go in the cup again.

Rocket: You speak Groot?

Thor: Yes, they taught it on Asgard. It was an elective.