Sound effects can really separate a good movie from a great movie. I suggested that if a picture is worth a thousand words, sometimes a sound is worth a thousand pictures. Consider how various sound effects can affect the mood of a scene:
- A quiet room somehow seems even quieter if you can hear the subtle ticking of a clock.
 - Applause, cheering, or laughter suggest how the viewer should feel about an event in the movie.
 - Chirping birds suggest peace and serenity.
 - Footsteps make movement seem more real, even when the feet are not shown in the video image.