lols caller()

gistfile1.txt

class Foo
  def hello
    puts "Original Method"
    puts caller(1)
  end
end

class HijackStuff
  def hijack
    Foo.class_eval do
      define_method(:hello) do
        puts "Got My New Method"
        puts caller(1)
      end
    end
  end
end

def do_stuff
  HijackStuff.new.hijack

  Foo.new.hello
end

do_stuff