"Yep. The original story, that coined the word or at least brought it into the public consciousness, is that of the Golem of Prague, which is set in, what, the 1200s or so, but only proven to date to a few hundred years after that, if I recall correctly - which I may not! I'm not guaranteed to be right just because I sound like I know things!
"Anyway, wanna hear the story? It's honestly kind of dark, but it's not, like, gory, just that - well, there's a lot of bad things that happened to Jewish people, and this is a story that's got one of those times as a backdrop."
She's assuming they do, honestly.
"So, back in the 1200s or so, whoever was in charge of Prague had started harassing, expelling, and otherwise trying to attack the Jewish people in his country, because...honestly a diatribe about persecuting minorities because outgroup-hate is politically convenient is perhaps a bit much for a light train ride, but - yeah, whoever this was, he wanted the Jews gone. So the people of Prague, the Jewish people of Prague, they go to their rabbi, a wise man indeed, and they ask him what to do about this. And, well, there's not very many good solutions here, especially because the one thing Jewish religious law, as first laid out in the Torah - which some of you may know as the Old Testament - and expanded upon by thousands of years of rabbis debating about things in the Talmud, definitively says you shouldn't do, despite a doctrine of breaking any law to save lives otherwise - well, you can't lie about being Jewish. You can't pretend to renounce God to save your life and still be a Jew. But. The rabbi is not just wise in the Law, he is wise in the mysteries of God. And so, he gathers some clay, that which of man was made, and sculpts it in man's image - although I'm given to believe the Golem of Prague was only about as tall as you, even if his arms and legs were about as big around as my splayed-out hand. Anyway; the wise rabbi has sculpted his golem, but it is not yet alive, and it must live, if it is to defend the Jewish citizens of Prague from their oppressors. So he writes four characters into the clay of the golem's forehead, that I believe spelled emet. I'm not actually sure I remember the precise meaning; I suspect it's wisdom, of a sort.
"And this simply works! The Golem of Prague protects Prague's Jews from the attempted purge. But...the rabbi is a wise man, and he knows the Golem cannot remain as it is, now that the threat is gone. Why that is so, I do not know, but he is wise.
"So he takes his thumb to the forehead of the golem, where he wrote emet a long time ago, and smudges out, not the name, not the word, but one, single, character - transforming emet - wisdom - into met - ...death.
"And that, ladies, gentlemen, and other distinguished guests, is the story of the Golem of Prague."