Ben Stiller has let slip on the secret behind one of Tropic ... on it and rewrote these scenes and put them in, and Tom said 'also, I feel like I want to dance in the movie, I just want to dance ...

Those wild dance moves helped define Grossman’s over-the-top personality. Ben Stiller, who directed, co-wrote, produced, and starred in Tropic Thunder, said Cruise’s input was a game-changer.