How about a limerick for the most unessential, essential person involved in movie-making:
the critic.

Every movie has a critic. If there weren't any critics, there wouldn't be any reviews. And if there weren't any reviews, there wouldn't be many views.

So, you see, any kind of criticism is welcome criticism.

You could say a damning critic is their own worst enemy. :)

A "Smash!" isn't a "Smash!" without news
So a critic is our ticket to views.
If they love us, we love 'em
If they hate us, we love 'em
'Cause nothing succeeds like reviews.

"Smash" brings to mind the work of the "stuntman".

Let's hear it for the stuntman
Who'll risk life and limb if he can
Add a thrill, as the star
Reclines safely afar
Bloody make-up streaking his tan.