2. 'Inception' (2010)
Christopher Nolan's sci-fi heist thriller has DiCaprio entering people's dreams and stealing their thoughts — only this time, for that proverbial one last job, he and his team are hired to implant an idea inside someone's mind instead of boosting the usual cerebral data. How did a film with a plot so byzantine, and a set-up so offbeat, ever become such a massive hit? Credit Nolan's dexterity with dialogue and interlocking setpieces, but let's not also forget DiCaprio's remarkable, underrated performance as a brilliant, tormented thief trying – and failing – to keep his own demons at bay. This is one of the saddest blockbusters you'll ever see, and a lot of that is due to to its star, who brings a humanity to what could have easily been a generic brooding hero type.