Black Handkerchief of Happiness (幸せの黒いハンカチ Shiawase no Kuroi Hankachi?) is a song that Brook sung to awaken his crew when he was alive. In a filler episode of the anime he sings it to wake up the Straw Hat crew as well. It is loud, fast paced and annoying. The CD version was released in Japan with the full song which only lasts 30 seconds. The 30 seconds involves Brook singing/shouting at the top of his lungs while playing the violin obnoxiously.