Dagnammit, Americans! You come over here, influencing our pop music, straightening our teeth and changing our traditions. And we do, of course, love you for it.
Take St Patrick's Day, for instance. As this rather informative video - made by US Embassy in Dublin - shows, there are some supposedly 'traditional' elements of the Irish saint's celebratory day that aren't quite as 'traditional', or indeed 'Irish', as you might have thought...