Well, now... I wrote this for a combination literature and English grade when I was in eighth grade.  It's my favorite ever.  Except for lots of others.  tee-hee.

Fear

The ancient trees cause early ends of sight
As a light breeze sways the weeping willows.
Watch as leaves drop into the pond of woes,
But look not on obscurity called fright.
Why does the unknown darkness cause this fear?
Innocent trees contribute to such plight!
Fight fear, and let logic end fear-blocked sight;
Push fright'nin oaks aside; let hope be near.
Foreboding leaves cross paths and bring the dark,
Mirth dies as phobias raise the unclear;
If fright were vanquished all creatures would cheer,
For with the fear's defeat comes light and lark!
This fear is a mask of uncertainty.
It leaves in its wake death and upset trust.

See...it's a sonnet, so it's got 10 beats per line...and a rhyme pattern...plus the assignment called for a metaphor.  Metaphors are fun, so I extended the metaphor!