Ask HN: What do you present to children on career day?

A teacher I know in a small town in Texas, has invited me to speak to 3rd-5th graders about what I do for a living as a software engineer. I feel comfortable talking about what I do day-to-day with adults who aren't technical, but I'd like to show the kids how cool and powerful programming can be to get them excited to learn on their own.

Some colleagues suggested using Scratch, but I'm inclined against it because I'd rather show them something in a language they could get paid to write. My first guess was to build some Selenium stuff in Python that would drive a browser, because that blew my adult mind when I first saw it, but everybody I've suggested that to has said it's lame, so I need ideas.

Ultimately I'd like to leave at least some of the kids with the impression that learning to write software is a generally applicable skill that isn't restricted to phone apps and games, and that it doesn't necessarily pigeonhole you into a specific career.