13. The Creepy Crawlers, also known as The Thingmaker

Where It Was Sold: Toy Stores, Macy’s, Sears, Hudson’s, and Companies
Initial Cost: $10–$30*
The activity toy known as the Thingmaker (also known as Creepy Crawlers) was created by Mattel. The plaything was made out of several metal molds that were filled with the chemically slimy Plasti-Goop. The plastic material would take on the shape of the mold thanks to the hot plate.

The Thingmaker @bingteam/Pinterest (AKA Creepy Crawlers)
Thanks to the creation of the Consumer Product Safety Commission in 1973, the toys’ lifespan was rather brief. The Thingmaker was an excellent educational toy, but because it used heat and chemicals, it wasn’t safe enough to be sold.