Apples

You might dispute the apple on the head
(Did Newton say it actually fell,
And how adept a shot was William Tell),
And you could even argue it was said
That some folks really loved Procrustes's bed,
But please don't throw your pennies in this well.
I have to drink the water, which I'd sell
If magic fish swam here, alive or dead.

What do I mean, about dead magic fish?
I met one, in a pond down by the wood,
Who didn't treat me quite the way he should
And ended up in an enchanted dish.
He sniggered when I tried to make a wish,
So I threw apples, and my aim was good.