:)
Thankfully there's been the occasional friend who got really excited at the thought of being able to use their browser's devtools to change things on the page through css or javascript.
Edit: because 'hey look how I just told react to re-render the ENTIRE page and it only updated that one div' impresses nobody.
They can mess with it all they want, they're not really changing anything.
This is for the ones that did't really came to learn but thought they could fire up a gaming website or facebook. Something to keep their attention instead of just saying "no, not allowed".
I really like that CSS transition/rotation trick, made a note of it, because it seems like a perfect step up after you've gotten the concept of being able to change text.
If anyone knows more of these simple "party tricks", please do post them here :-)
Another one I like, surprisingly popular among the younger kids (7-9 or thereabouts), are the two linux command line tools "sl" and "cowsay". Two characters to display an ASCII steam locomotive in that weird black hackers rectangle? Yeah! Those two are actually super-educational, because they're not installed by default on most systems so you quickly explain/show them you need to "sudo apt install" them first (tell them "apt is kind of like the app-store and sudo means you want to do it as the super-user", not entirely correct but good enough for now). The more clever kids actually remember this and next time they want to show another kid, they partially remember they needed to do something with that apt install line (and then ask me what it was again, exactly).
And I'll add a counter-point: rm -rf stories, things like piping /dev/random to speakers or the first time I accidentally did the equivalent of whiel(1) fork(); were an integral part of my early appreciation and enjoyment of computers. I'd argue they are fairly analogous to things blowing up in chemistry.
[1] http://www.phoronix.com/scan.php?page=news_item&px=UEFI-rm-r...
http://blogs.sciencemag.org/pipeline/archives/2008/02/26/san...