In fact I have seen "Summer of Sam" Justin - along with all the "Godfather" movies and the ultimate Italian-American Boomer saga, "Goodfellas." (And yes, the scene you describe sounds totally familiar!)
This brings up an interesting point: There is a "movement" on to boycott the sponsors of "The Sopranos" because it "stereotypes" Italians. Among those on board are Marge Roukema (New Jersey Congresswoman), Andrew Cuomo and Bob Toricelli (New Jersey Senator) - all Boomers. Funny how Italian-American Busters like Valerie Bertinelli, Madonna or Quentin Tarantino aren't getting involved in this ridiculous campaign (and James Gandolfini, who of course plays Tony Soprano, is himself a Buster, born 1961). Certain people need to get a life!
Right now if you go to http://www.babybusters.org you will see an "Under Construction" message. Try back again in a couple of days and the real thing should be up by then!