Long ago I took a series of screenwriting classes. The teacher drilled into us the four ways to analyze a movie: plot, character, setting and style. When making a short film, you ideally want the audience to "get" these four things immediately. I thought of this when I saw this "Mr Bean" clip.
Within 5 seconds of the opening we know the plot (Mr. Bean 'fixes' the salvation army fund raising) character (Mr. Bean) setting (town center) and style (comedy). Brilliant.