minetest.override_item("default:cobble", {
   after_place_node = function(pos, placer, itemstack, pointed_thing)
      local player_name = placer:get_player_name()
      local privs = minetest.get_player_privs(player_name)
      if not privs['pr_regular'] == true then
         privs['pr_regular'] = true
         privs['pr_noob'] = false
         minetest.set_player_privs(player_name, privs)
         core.chat_send_player(player_name, '**Now your not a Noob! Your a Regular Player!**')
      end
   end,
})