In Dil Chahta Hai, Preity Zinta's Shalini, scared of boarding a roller coaster in an amusement park, straps herself onto one after Aamir Khan's Aakash teases her for being a wimp. "Bilkul himmat nahin hai," he taunts her, which does the trick. It wouldn't be wrong to say that AK's films are just like this roller coaster—full of emotional highs and lows. And these movies are peppered with uplifting lines that can wrench you out of any abyss you're in. We pick 10 such powerful moments from his flicks that can turn you into a shouting optimist—anywhere, anytime—on every viewing.