Irish or not, today's a good excuse to watch one of the few Irish-themed films that does not have 'Leprechaun' in the title.

Martin Scorsese's epic period piece, Gangs of New York, follows the rivalry between the Irish immigrants and the Americans in mid-19th century New York City. Starring the amazing Daniel Day-Lewis and Leonardo DiCaprio, the film was nominated for 10 Academy Awards, including Best Picture.

In the Gangs of New York: Making Gangs of New York bonus material, the actors, director, historians and producers all give great insight to the background of American immigration, during a tumultuous time in America, when it was at war and still being built.

Scorsese: There were so many [Irish immigrants], so fast and for such a long period of time that it created that 'who has the right to be here' situation.

Daniel Day-Lewis: People were more inclined to stick with their own communities because they felt strength in that.

Leonardo DiCaprio: At the end of the day, it boils down to territory...these are the origins of gangs in America.

Not only is today a great day to wear green, watch a parade and find a pot of gold, it's also a perfect day to read up on more 'Gangs' history. Lucky for you, our Guest Blogger, Professor Brian Ferguson, an Anthropology Professor at Rutgers University, blogged for us about the earliest gangs in New York City. Read all about it right here and when you've filled your knowledge cup to the brim, sit back and enjoy clips from the film.

Happy St. Patrick's Day!