n a story that appears mysteriously and spreads spontaneously in various forms and is usually false; contains elements of humor or horror and is popularly believed to be true
Search for Hoffa mystery endures for decades Jimmy Hoffa's disappearance almost 40 years ago has been the stuff of urban legend, prompting numerous theories about what happened to the former Teamsters leader.
June 19, 2013 - Associated Press via Yahoo! News
A Field Guide To Jimmy Hoffa Searches The whereabouts of the ex-Teamsters boss is the stuff of urban legend. Here are the highlights and lowlights of the various searches for Jimmy Hoffa's body.
June 18, 2013 - NPR