Korean Air isn't the only airline that turned back for improperly served macadamia nuts, or a similarly bizarre reason.
from Travel Feedly http://www.ibtimes.com/its-not-just-korean-air-six-nutty-reasons-planes-have-returned-their-gates-takeoff-1745401
from Travel Feedly http://www.ibtimes.com/its-not-just-korean-air-six-nutty-reasons-planes-have-returned-their-gates-takeoff-1745401