The opening scene of a film should last 2-5 minutes and use dramatic music and flashbacks to concentrate the viewer. The main cast of up to 3 people should be featured in text centered at the beginning of the scene, then in a corner for the remainder to avoid blocking the visuals. Potential viewers learn of new films through TV and YouTube ads, and typically watch at the cinema or online at home, deciding to see a film based on its advertising or word-of-mouth recommendations.