He once chucked a huge chunk of land
Now known as the Island of Man
Don’t call him “Mick,” fool!
The great Finn McCool
Whose grandson’s great-grandkid is Dan

That’s all you’ve got to go on, “myth.”  It’s vague enough to be almost anything.  The myth that drinking Coca Cola and eating Pop Rocks will explode you?  The mythologizing of the Obamas?  Demythologizing the American jackalope?  The myth of global warming (if you’re into thinking like that)?  The myth that Bert and Ernie are gay?

And then there’s the regular stuff:  Greek, Egyptian, Mesoamerican, Oceanic, Chinese, Aboriginal, Vedic, etc.  Duh.