At what point does a shakespeare say

I feel it's time I write a play

What subject shall it be today

A tragedy I've done

Lovers twain have been united

Audiences are delighted

No doubt I shall soon be knighted

Royal fame I've won

The queen has come to every show

And, flattering, she feigns to know

A couplet from a verse, also

A refrain from a rhyme

But the ones I aim to pleaseth

Most of all upon my kneeseth

Are the folk who cough and sneezeth

Through my prose sublime