dont let me near ruby

stupid.rb

class Fixnum
  def random_number_between_oneAndTEN!(yaSuRE)  
    if yaSuRE == 'ya dude!'
      return rand(10)
    else  
      raise 'YA GATTA TYPE YA DUDE!!!!!!!'
    end
  end
end

[3] pry(main)> 4.random_number_between_oneAndTEN!('ya dude!')
=> 9