Every March 17th, we celebrate St. Patrick's Day by dawning green, pinching those who don't have it on, drinking lots of beer, and eating corned beef and cabbage. But what do you really know about the holiday? Like, did you know St. Patrick wasn't even Irish? And you know how he drove the snakes out of Ireland? Well, did you know there weren't any snakes in Ireland?! Check out this video from The History Channel to get a crash course on the things we didn't know about St. Patrick's Day.