Bourbon Street, New Orleans, LA Can't make this stuff up, folks: "The concept of wearing a horse head mask for purposes other than as a Halloween costume can be found in the The Lonely Planet Guide to Experimental Travel published on June 29th, 2005. In the book, one of the social experiments called “Horse Head Adventure”suggested one of the travelers to wear a horse mask while the group were touring places on vacation." knowyourmeme.com/memes/horse-head-mask I guess I need to run out and get a copy of this book!