Shotgun sort in Ruby

shotgun_sort.rb

class Array
  def shotgun_sort
    sorted    = false
    arry      = self.dup
    iteration = 0

    while !sorted do
      puts "Attempt #{iteration += 1}" if $debug
      arry.shuffle!
      sorted = arry.each_cons(2).all? { |a, b| (a <=> b) <= 0 }
    end

    return arry
  end
end

$debug  = true
numbers = [1, 10, 5, 2, 20, 3, 6]
puts numbers.shotgun_sort.inspect