In case you wanted to know, I'm participating in PowerPoint Karaoke. If you want to know what it involves, this pretty much sums it up.
Imagine this: You have to deliver a PowerPoint presentation about an unfamiliar topic, with slides you’ve never seen, to an audience eager to heckle and laugh at you. If you’re in your underwear, you’re having a nightmare. If you’re clothed, it’s called PowerPoint Karaoke. (source)
Also, a quick example
In essence, I will be getting up on stage and presenting a slide show on an unknown topic with slides I've never seen. You may ask yourself, "Why?" The truth is, I have no idea, but I'm kind of freaking out right now. I'll let you know how it goes.