I remember as a kid playing with springy door stops.  Our house was full of them.  It always made a very satisfying  sound. I think we have some in our current house as well.  But for some reason these days I am not all about getting on my stomach on the floor and playing with them.  I mean it's just a spring screwed into the base board.  Caution this could be addicting, but at least you don't have to get on the floor to play with it.  CLICK HERE FOR SPRINGY MONDAY FUN!