Classy

no_class.rb

class Symbol
  def with(arg)
    lambda { |obj| obj.send(self, arg) }
  end
end

tweedledee = Class.new.new
tweedledum = Object.new

heroes = [tweedledum, tweedledee]

yell = :upcase.to_proc # == lambda { |str| str.upcase }
whisper = lambda { |str| str.gsub /./, '.' }

p tweedledee.class # => #<Class:0x9081110>

# Name the class
Object.const_set "FatMan", tweedledee.class

p tweedledee.class # => FatMan

tweedledee.class.send(:define_method, :say, yell)
tweedledum.singleton_class.send(:define_method, :say, whisper)

p heroes
# => [#<Object:0x990a584>, #<FatMan:0x990a598>]
p heroes.map(&:say.with("hello"))
# => [".....", "HELLO"]
p heroes.map{|x| x.say("hello")}
# => [".....", "HELLO"]