James MIchael Grimes, 28, discusses how he narrowly survived falling off a cruise ship and spending 15 hours in open water on Thanksgiving (screengrab/ABC/Good Morning America)

James Michael Grimes’ Thanksgiving was unorthodox.

After winning an air guitar contest, he toppled off the side of a cruise ship, battled a "sea creature," treaded water for more than half a day, and survived on bamboo — or maybe just some kind of stick — until the Coast Guard picked him up the next day.

And, according to him, though alcohol was consumed, it did not play a part in the chain of events.

Mr Grimes, 28, survived a harrowing 15 hours at sea that could have turned tragic had he not managed to keep himself afloat while waves washed over him in the Gulf of Mexico.

Mr Grimes and his sister were on a Carnival cruise ship departing from New Orleans and bound for Cozumel, Mexico on 23 November. At some point that evening, Mr Grimes’ sister noticed he had left to use the restroom and had not returned. After failing to return the following day, she reported him missing and, a few hours later, the Coast Guard was notified that the man had vanished.

According to Mr Grimes, who gave an interview to ABC News’ Good Morning America about his ordeal, that night he had just won an air guitar competition in one of the ship’s lounges and had hit the bar to celebrate.