[blendorgat]

That fragment isn't any poem I know of. Google shows one result for an exact search of the opening, which is this post.

[cokernel_hacker]

I found more of it in here: https://www.oranlooney.com/post/playfair/

However, I can't determine where this is originally from...

[waveBidder]

it's… from men in black iirc, so if it knows movie scripts, it'd know this.