Zack Attack, er, Dedication

There once was a man named Zack,
Who tried to teach ducks how to quack,
He had quite a cow,
When they only would meow,
And this story is totally fact.

So he went on a great big attack,
Drove over them in a semi named Mack,
We got quite a laugh,
When he cut them in half,
For their insides were really part cat.

(Afterthoughts)
Dedicated to all the Zacks I know and the ones I don't (whether I want to know them or not).