gistfile1.rb

#!/usr/bin/env ruby

module MethodFromClass
  def self.included(klass)
    Object.send(:define_method, klass.to_s) do |*args|
      klass.new(*args)
    end
  end
end

class Foo
  include MethodFromClass

  def initialize(name)
    p name
  end
end

Foo.new 'lee' #=> 'lee'
Foo 'lee'     #=> 'lee'