How the Internet would have debunked the myth that St. Patrick rid Ireland of all its snakes. Per The History Channel:
While it’s true that the Emerald Isle is mercifully snake-free, chances are that’s been the case throughout human history. Water has surrounded Ireland since the end of the last glacial period, preventing snakes from slithering over; before that, it was blanketed in ice and too chilly for the cold-blooded creatures. Scholars believe the snake story is an allegory for St. Patrick’s eradication of pagan ideology.