「僕だけ」かもしれませんが強調したいことを「不自然」に「カギカッコ」で囲む文章はなんとなく「おっさん」ぽい印象がある

ojisan.rb

require 'yahoo_parse_api'
VERB_RATIO = 0.3 
NOUN_RATIO = 0.3 
# IDはこちらからどうぞ https://e.developer.yahoo.co.jp/register
YAHOO_APP_ID ='your app id'

YahooParseApi::Config.app_id = YAHOO_APP_ID
yp = YahooParseApi::Parse.new
sentence = ARGV[0]
if !sentence || sentence.length == 0
  exit 1
end

result = yp.parse(sentence, results: 'ma')
words = result['ResultSet']['ma_result']['word_list']['word']

if words.class != Array
  puts sentence
  exit 0
end


arr =  words.map do |w| 
  str = w['surface']
  pos = w['pos']
  if (pos == '動詞' && rand < VERB_RATIO) ||
     (pos == '名詞' || pos == '形容詞') && rand < NOUN_RATIO
    "「#{str}」"
  else
    str 
  end 
end

puts arr.join('')