Dude, how about a little punctuation please? Don't be afraid to use quotation marks when you quote someone. Here's how it should look:

Quote from the Netflix movie Last Kingdom [which I watched earlier this evening]:
"I dream of humping you tonight. It is written in the stars; the gods will it." See, this is why the Celtic empire fell.

Notice how I changed "tonight" in your opening clause to "this evening." I did that to avoid repetition, which often confuses readers.

By the way, you are right to mock the Netflix dialogue. It is pure drivel. But I question whether there was ever a "Celtic Empire". The Celts were certainly far-flung and influential in their own way, but imperial? I think that's a bit of a stretch.