A 2006 Bollywood film, and Farhan Akhtar's remake of the 1978 film starring Amitabh Bachchan. This version stars Shah Rukh Khan, Priyanka Chopra and Kareena Kapoor. Follows the conflict between an Indian drug lord's lieutenant (a man known as Don), and his arch-rival; the cop DCP Desilva. After Don's death, Desilva replaces him with his lookalike Vijay in order to dismantle the drug cartel. Two other subplots involve Jasjit (who was screwed over by Desilva) and Roma (who was screwed over by Don.) Many many action scenes ensue.
I Never Said It Was Poison: Roma realizes Vijay has been Don all along when he says "I like wildcats." Slight subversion because he fully meant for her to realize it and revealed this information when there was nothing she could do about it.
Not His Sled: The original Don, released in 1978 and starring Amitabh Bachchan as Don, had Don actually die much earlier, in D'Silva's car, so viewers remembering it may think, till the end, that it's Vijay doing all that... till the twist at the end. It was probably for practicality more than shock value - Akhtar is releasing a sequel in December 2011, which, given the original ending, would have been difficult - it was happy and resolved everything.
Took a Level in Badass: Vijay, who goes from a bumbling comic character to being able to engage in badass fight sequences. While in the sky after falling from a plane. Subverted when it's revealed that Don knew about Vardhaan's plans from the start and had Vijay killed. The level of badass therefore makes sense for the character involved.