Vin Diesel, he's so talented! He's a polyglot six times over! Or at least he can say "I am Groot" in Brazilian Portuguese, French, Russian, Spanish and Mandarin Chinese (and English, duh). The line, a reference to his character in "Guardians of the Galaxy," was dubbed in each language for the Marvel's international marketing campaign. But you can see Diesel utter the line with aplomb in each dialect because ... well ... because he's Vin Diesel, okay? Okay!
Mandarin Chinese (plus all the others)