Incredible story of Vietnam War hero who survived 12 hours adrift at sea and tricked his POW camp captors into thinking he was an illiterate fool - while secretly memorizing the names of 256 prisoners to tune of Old MacDonald
Seaman Apprentice Douglas B. Hegdahl survived for two years in the infamous 'Hanoi Hilton' prison by posing as an illiterate fool, while secretly memorizing the names of 256 American servicemen.
Source: dailymail.co.uk