Shake a stick at

Why are you using a calculator for your Math homework?
Don’t you know that doesn’t exercise your brain at all?
Back in my day, we didn’t use calculators for Math problems.
We used sticks. To shake at things we counted.
Counting the first few things was easy.
But after a while your arm would get tired.
That’s when you knew when you had too many things to shake a stick at.
I knew a kid who could hold a stick in either hand for shaking at things.
He got sent to reform school for clubbing the Math teacher to death.