Here is a one I wrote for a girl with a spider phobia and a thing about wanting all spiders dead,
SPIDERS 

I killed a rather leggy spider today.

My chest puffed out,I was so proud ,

(Whisper) I'm scared of spiders but I don't like saying it out loud.

At first I whacked it with the heel of my shoe,

Then I threw it unceremoniously down the loo.

At first I was proud but then the guilt set in,

It might be someone's  ' brother or sister,it may be someone's mum or dad,

But thinking like that,it just makes me more sad .

So the next time you see a spider, don't squash it willy nilly.

I'm not asking you  to make it a pet,that would be silly.

Just spare a thought for the little spider  going on it's way,

And be happy in the knowledge you kept a family together today.