I remember riding inside the back of the spreader (tractor driven) when I was a kid and just laughing and laughing with my cousin watching the chunks fly through the air.  Recently I looked in the back of a spreader at all of the chains, sprockets, and rotating metal objects I couldn't imagine anyone putting their kids or grandkids in the back of one of those in this day and age.  Heck you can't even ride a bicycle without a helmet let alone riding in an operating manure spreader!  Oh, the good times on the farm.