One of the first DVD's I bought (along with The Fifth Element) way back when, this is a funny yet grim film-noir by Oliver Stone about bad luck getting worse and sick twists.  Great cast (Sean Penn, Jon Voight, Billy Bob Thornton, Joaquim Phoenix, Claire Danes, Jennifer Lopez, and many others) and an awesome score by Ennio Morricone, a favorite of mine.

I wasn't impressed.  A few funny gag's, and some continuing jokes from the previous movies, but it really dragged and was really reaching for laughs.  Stick with the first one.