How about something totally harmless? “Little Orby,” vintage 1961.
I wish I could show some video of this toy, but I couldn’t find any. Too bad–because Little Orby was way cool. See that little ring? You pull that, and Orby walks straight up the wall–maybe even on the ceiling.
That’s because there’s a spring inside, and suction cups, and the spring makes the suction cups rotate, propelling Orby forward. Show it to a college student today, and he or she will think it’s magic.
“Harmless” is a quality that’s harder and harder to come by, these days. If you can find it, treasure it.