infeeeeeD. B. Cooper - Unidentified man, who hijacked a Boeing 727 in 1971. Parachuted into the night with $200,000 ransom from the plane. Never been found or conclusively identified.
JaymesRSI thought I saw in a documentary that it was proven to be Loki after losing a bet with Thor.
There was another documentary that says he fought Bigfoot while a bunch of shirtless guys went jogging.