Eakin couldn't resist - these are the verse components of his reasons for judgment in Commonwealth of Pennsylvania v Noel and Travis:

A horse is a horse, of course, of course,
And no one can talk to a horse of course
That is, of course, unless the horse is the famous Mr. Ed.

Go right to the source and ask the horse
He'll give you the answer that you'll endorse.
He's always on a steady course. Talk to Mr. Ed.

horseA horse is a horse, of course, of course,
but the Vehicle Code does not divorce
its application from, perforce,
a steed, as my colleagues said.

"It's not vague" I'll say until I'm hoarse,
And whether a car, a truck or horse
This law applies with equal force,
And I'd reverse instead.

Because I cannot agree this statute is vague or ambiguous, I respectfully dissent.