There was a pre-LLM version of this called "battledecks" or "PowerPoint Karaoke"[0] where a presenter is given a deck of slides they've never seen and have to present on it. With a group of good public speakers it can be loads of fun (and really impressive the degree that some people can pull it off!)

0. https://en.wikipedia.org/wiki/PowerPoint_karaoke

Some consulting firms do this, one guy is giving the presentation live while others are in the next meeting room still banging out the slides.

That would make a great Wii game.

PowerPoint Hero.

Every presentation becomes improv

and with neuralink it would generate slides of the audience naked