Would you believe that the infamous Etch-a-Sketch was inspired by the replacing of a light switch?! Originally called, “The Magic Screen,” the toy’s inventor was working as an electrician when noticed that drawing on a light plate’s decal cover created images on its opposite side.

The truth is, many toys have accidental origins. So many, in fact, that the National Retail Federation compiled a list of the top ten most stumbled-upon playthings, including Play-Doh. Its creators had only intended the compound to serve as wallpaper cleaner. The oldest toy on the list is the Slinky. In 1945, Richard James, a naval engineer, dropped a tension spring he was creating for a battleship and watched it “slink” down a staircase. Two years later, Richard and his wife Betty sold 400 Slinkys during a 90-minute demonstration at Gimbel’s Department Store.

Photo: Inside view of an Etch-A-sketch toy showing the plotter-like inner mechanism, with the aluminium dust removed, Wikimedia Commons.