Brook was the skeleton who haunted the Benumbed Castle Library on Thriller Bark, He walks throughout the halls whistling the tune of Binks Sake along with other songs, walking with his cane as he haunts the corridors.

As you came in the library with a flashlight in hand, pointing it around at sudden noises and dark halls, you hear bones rattling. You poke your head around a bookshelf and are greeted by Brook appearing

Curses upon you!! Yohohoho! he exlaimed before laughing