In 1943, the idea for the Slinky toy originated when engineer Richard James dropped a tension spring on the ground and saw how it moved. The first Slinky toys were sold in 1945 at Gimbel's Department Store in Philadelphia, Pennsylvania. And since then, stairs have never been left alone.
Also on these boards
Kaleidoscope - loved this
I spent hours upon hours playing with this.
Bunny Rabbit Bendie Toys. This style of toy always freaked me out a bit. Can't quite put my finger on why though.