Wow, yeah. I tuned him out when I saw he wanted us to declare our variable types. I did not listen to all of the audio, but in there somewhere you will hear some nutjob asking if, given that Lisp has finally started taking over the landscape and he now wants us to run up the white flag and adopt static typing, he also thinks it is time for mainland China surrender to Taiwan. That was me.

  irb(main):003:0> x + 7
  TypeError: can't convert Fixnum into String
          from (irb):3:in `+'
          from (irb):3