This is a real trick I learned from my professor in college. If you ever read a Marvel or DC comic and notice silhouetted panels, chances are the real reason behind them was because of deadline crunches.
@Fatman: sometimes though it really suits the style and it isn't made in a lasy way. I think about an anymation movie made exclusively in silhouettes! I think it's 'Princes and princesses' by a woman I forgot the name... It's made of cut out papers, only silhouettes!
M
@Iamouchemasquee lazy* animation*
you're welcome