Riffing people's favorite gang movies?

[peiz11]

I was watching Godfather Part 2 today on TV and while I understand why people cherish this movie as one of the greatest I'm not the biggest fan.  I like it enough to put it on if it happens to be on TV or something.  In any case, I thought that a movie like Godfather, Scarface, or Goodfellas would be great to riff.  These are good movies but anybody else think they could be great riffs?  A lot easier to sit through than say, Wicker Man, that's for sure.  (God, Wicker Man was horrible)