It’s not easy being Groot. Not only do you have to contend with animators clutching their pearls about your mighty twig and berries, and not only are you subject to the whims of filthy-minded GTA modders, but you also have to convey a deep panoply of emotions when your vocabulistics are limited to “I” and “am” and “Groot,” exclusively in that order.
So, how does Vin Diesel know exactly what intonation of those words director James Gunn is looking for in Guardians of the Galaxy Vol. 2? Well, besides the obvious answer (stage directions), James Gunn revealed on Twitter what the real secret is: a special script only he and Diesel possess, which shows what Groot is really trying to say:
I must possess this script. Or, at the very least, let’s get a parody video which puts fake captions on everything Groot says. We already know what Groot was yelling in this scene: