1 Martian 1: Our surveillance operations on Earth over the past few years have been successful. Unfortunately, one human suspects the truth.
2 Martian 1: Your mission is to assassinate him.
3 Martian 2: Won't that alter the course of Earth history?
3 Martian 1: Eh, what's one guy's death going to do?
4 Martian 2: Fair enough. What's his name?
4 Martian 2: Archduke Ferdinand.

It's interesting that the article about Archduke Franz Ferdinand himself on Wikipedia is less than a third of the size of the article about his assassination. And they don't even mention the true culprits!

His assassination led, by the way, for anyone who didn't know, to a little bit of trouble.

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2022-10-15 Rerun commentary: Oh, that's right. We're still in the past after the universe-reset and heading back towards the present timelines of all the themes. I was a little confused myself for a second there as I pondered what to write here.

I suppose you can tell it's the past because the Martians are using reel-to-reel tapes. (Ignore the fact that they're still using them in the modern day.)