Say I am monkey patching a method in a class, how could I call the overridden method from the overriding method? I.e. Something a bit like `super`

E.g. 

```
class Foo
  def bar()
    "Hello"
  end
end 

class Foo
  def bar()
    super() + " World"
  end
end

>> Foo.new.bar == "Hello World"

```