Mythical Beast Poem~ The Calculator

Have you ever come across a Count Calcula?
They are as vicious as a tarantula
And have teeth as sharp as spikes.
Making you scared and confused is what he likes.
Their buttons are very complex,
And they get angry like a t-Rex.
Frightening you is only one of their talents.
They are confusing and almost get you off balance.
If you push one button wrong,
It is likely that your math problems will prolong.
Calculas get easily mad,
And will make you severely sad.
But sad is there weakness
So with a snap, they'll cheer you up with sweetness!