simple, not actor, not actress, but entire movie cast and there have been lots of really amazing one
too me the perfect movie cast will forever be Snatch, I don't know what it is with this movie but everyone is perfect in their roles, hell all Guy Ritchie Movies are like this probably why I like them so much.
HM: to Dogma and Boondock Saints
Silence of the Lambs.
Just perfect.
The Departed, just enough gay to make it right.
(no offense to gay people/Leo di Caprio fans)
lol why the dicaprio hate? He is an extremely gifted and his track record speaks for itself.
Johnny Depp has been in way more crappy movies than dicaprio. Oh well.
Pretty much every Wes Anderson movie.
buttcheeks
The Godfather Part 1
Brando, Caan, Pacino, Duval…need i continue?
Eternal Sunshine of the Spotless Mind.
It has Jim Carrey, Kate Winslet, Kirsten Dunst, Elijah Wood…
And their roles are perfect and their acting is superb.
@The:
Pretty much every Wes Anderson movie.
Ditto, I was just about to mention Royal Tenenbaums. Gene Hackman, Anjelica Huston, Owen Wilson, Luke Wilson, Ben Stiller, Gwyneth Paltrow, Danny Glover, Bill Murray, Alec Baldwin. Completely ridiculous lineup.
Eternal Sunshine of the Spotless Mind.
It has Jim Carrey, Kate Winslet, Kirsten Dunst, Elijah Wood…
And their roles are perfect and their acting is superb.
Another great one, and to gilrules DeNiro playing Brando >>>>>>>>> the real Brando 
part II forever.
not really a movie everyone heard of, nor with actors many will know, but I'm gonna say League of Gentlemen's Apocalypse, I mean, theres loads of characters, most played by the same three people (and each and everyone looks pretty different than the other) along with cameos from some pretty major people like Peter Kay, Simon Pegg, Victoria Wood, David Warner and others.
Hitch-hikers Guide to the Galaxy is second like lol
Although I think Free Jimmy will take the spot of best cast when it comes out over here.
I'm going to say Sin City had an awesome cast.
Rocky Horror Picture Show and Psycho. Those movies have indeed amazing actors.
The Star Wars trilogy, and I ain't talking about episodes 1 through 3.
Another great one, and to gilrules DeNiro playing Brando >>>>>>>>> the real Brando
psht, get outta here. I love part II but part I kicks its ass.
the bigot who thinks being an asshole is actually worth shit
Jingle All the Way-
Arnold, Sinbad, and Phil Hartman all in one movie. Brilliant.
