Sheldon Allan Silverstein - Magical Eraser

She wouldn't believe
This pencil has
A magical eraser.
She said I was a silly moo,
She said I was a liar too,
She dared me prove that it was true,
And so what could I do--
I erased her!

Sheldon Allan Silverstein

http://www.poemhunter.com/poem/magical-eraser/