craziest ruby I've written all week

def coefs_to_parabola(*coefs)
  proc, order = coefs.inject([lambda{|x|x},0]) do |(proc,order),coef| 
    [ 
      Proc.new {|x| coef * x**order + proc.call(x) },
      order += 1
    ]
  end
  proc
end