Popcorn Falls, James Hindman’s new two-hander, begins with a burst of energy. With “O Fortuna” from Carmina Burana blaring through the speakers, the performers, Adam Heller and Tom Souhrada, sprint about the stage preparing the props, costumes, and set pieces for the screwball play to follow. Indeed, the mad dash is intended to set the scene for the evening’s romp in which the two actors play a combined total of 21 different characters.