Remember Creepy Crawlers and Creeple People? Creepy Crawlers were bugs, worms, etc., and Creeple People were weird heads and feet that you stuck on pencils. You poured goop into molds, and placed the molds on a hot metal plate to cook. A very hot metal plate. I understand a safer version resembling a small Easy-Bake oven came out more recently, but somehow that isn't the same. I don't think it sold the same, either.
Another oldie and not-so-goodie: did anyone else try computer programming on punch cards? You did not want to drop those things.
It had all the requirements for kids to have a good time - high temperatures, electricity, a pan of water, brightly colored toxic liquids in a squeeze bottle. Why are these not popular today? Give one to the kids in the basement and you can feel safe knowing they're playing with it unsupervised!
On punch cards, I remember being in the lab an hour before a final project was due. Some kid with a cardboard suitcase, all the cards carefully arranged in precise order, came running in and headed for the reader. Then he tripped and the cards went scattering across the floor. I've never seen anyone start crying so quickly or loudly!
We had to turn in program listings with our output. A favorite trick was to insert a comment card into someone else's deck which would create a line on their listing saying something like "Professor Jones is a jerk"... or something much, much worse!
Ah, the good ol' days!