Voice quality is a very, very important thing. A beautifully timbered voice can make the foolish sound clever. A juvenile, chirpy tone can make the experienced professional seem like an vacuous twit.
And a well-placed voice over can turn a touching scene into this:
[youtube http://www.youtube.com/watch?v=WfAww-6X2Ig&w=420&h=315]
This is an old video, but I laugh myself silly every time I see it.
