Photo: Paramount It’s one of the sweetest (and now, sadly, rarest ) sounds in the world: a movie theater full of people laughing. And I mean really laughing . Not just the occasional chuckles of humor-laced action flicks, or the gentle giggles of rom-coms (which are, to be fair, their own endangered species ), or even the droll chuckles of playful indies. I mean the long, loud belly laughs generated by an honest-to-goodness comedy whose sole purpose is to make a packed audience lose its shit.