Snopes say that they get a lot of calls from people asking if the story is true, and those people are usually incredulous when told: "No!"
“It’s a totally bogus story, but over the last four months we’ve gotten at least 12, maybe 18 calls from different media sources trying to confirm that,” said Cmdr. Kevin Wensing, an Atlantic Fleet spokesman in Norfolk. “Unfortunately, some of them don’t check it out. They just repeat it.
“The first time I heard of it was — oh, let’s see, how long — about 10 years ago or so, I think. “That story’s so old,” Wensing said, “it probably started out back in the galleon days, or back when there was a big lighthouse at Alexandria, Egypt.”
I'd guess that Allan first told the story about that time.