core_ext.rb

UnboundMethod.class_exec do
  def to_proc
    method = self
    lambda { |*args, &block| method.bind(self).call(*args, &block) }
  end
end

option_2.rb

module MyModule
  def some_method arg
    [self, arg]
  end
end

m = Object.new.extend(MyModule).method(:some_method)
'abc'.instance_exec('123', &m) # :( doesn't work!
# => [#<Object:0x...>, '123']

'abc'.extend(MyModule).method(:some_method).call('123')
# => ['abc', '123']

Allows you to do something like:

obj.instance_exec(x, y, z, &mod.instance_method(:bork))

as long as obj has mod in it's ancestors

(class << obj; self; end).ancestors.include? mod