The idea on the program was that SpongeBob invented it himself. (As the narrator describes it, SpongeBob loves holidays so much he celebrates one every day…even if he has to make them up.) Seeing that he lives under the ocean, that may be true in his case.
“Hey Gary! It’s Leif Erikson Day! Hinga-dinga-durgin!”
Pale? I had no idea he was an albino!
No offense taken. 
Now off to that “classical art penises” thread… 
I feel even sillier. I was wondering why we would name a holiday after the guy who sang “I Was Made For Dancing.”
I need sleep.
Admittedly, 1170 is post-Erikson… but, if these speculations are to be credited, Madoc ab Owain Gwynedd founded an actual colony quite a way before Columbus. (Are they to be credited?)
I’ve got a book at home entitled Madoc that claims that there’s no real basis for this – he’s not even in the Welsh king lists.
On the other hand, William Boland devotes a chapter to him in his omnibus They All Discovered America, and includes a picture of the plaque devoted to him down in Kentucky.
My take: They travel all the way to America and they don’t find a place to land and stake out until Kentucky? About as believable as the Kensington rune stone in Minnesota. At least the folks who claim the Vikings, the Irish, and Prince Sinclair of the Orkneys all put their putative landing points up in New England.
Ah, but how do you account for this
An inundation which swept the earth? Could there be a better description of Welsh weather?