Based upon my experience with 8th graders today.
  1. Know about the Bottle Flip. Doesn't matter if you're telling them they can't do it anymore. They're just impressed you know what it is.
    [this is just taking a plastic bottle, partially filled, and flipping it...but it has to land cap end up. I think there was a YouTube video of some kid that did it for a talent show]
  2. Know about dabbing. If you want them to completely FREAK OUT, dab. Again, doesn't matter if in doing so you are informing them that the classroom is now a dab-free zone.
    [seriously, blew their damn minds when I did a single dab. You'd have thought I did a back flip or something]
  3. That's it, apparently.