O Brother, Where Art Thou? - I Am A Man Of Constant Sorrow

You will find a fortune, though it will not be the one you seek. But first... first you must travel a long and difficult road, a road fraught with peril. You shall see things, wonderful to tell. You shall see a... a cow... on the roof of a cotton house. And, oh, so many startlements. I cannot tell you how long this road shall be, but fear not the obstacles in your path, for fate has vouchsafed your reward.

Love this song. Me and a buddy sang this song at his wedding and then again at my wedding. People were hooting and hollering because we did so well on it

Great song, great movie.