If you have absolutely no clue who or what the "hurdy gurdy man" is,
this is what it boils down to:
"A hurdy gurdy (also "wheel fiddle") is a stringed musical instrument in which the strings are sounded by means of a rosined wheel which the strings of the instrument pass over. This wheel, turned with a crank, functions much like a violin bow. Melodies are played on a keyboard that presses tangents (small wedges, usually made of wood) against one or more of these strings to change their vibrating length, and therefore pitch."
Conclusively a "hurdy-gurdy man" should be a person more or less capable of "fiddling the wheel", right?
Now, that doesn't sound all too creepy. But Donovan's song of the same name sure does. And for everyone who is still fascinated by this piece of music in the end-titles of "Zodiac", head on this way for a special presentation: I found the music video for this, and some rather interesting trivia along with it!
Apparently Donovan wrote the song while hanging out with the Beatles in some kind of guided meditation camp -- and of course while he was high on some obscure substances!
The song has been used for it's creepy atmosphere before in the 2001 pedophile-drama "L.I.E." (link) and to top things off, Donovan's daughter Ione Skye (Imdb) turns out to be an actress, who once played an uncredited side-character named Kathleen Johns ... -- in a nice little movie called "Zodiac".
Watch the creepy video already:
Disclaimer: The video may have been posted by a user with no official right to do so.