Here's the thread rules - you can post as many movies as you like, but it must be one movie per post, unless you wanna comment on previous posts. Explain why you think your choice is the best. Lets see how far this can go.
I thought Al Pacino and Robert De Niro in Michael Mann's Heat is the stuff of Legend. How often do you get to see two of the greatest actors star in a movie like that. They tried to get that back in Righteous Kill, but it just couldn't work. I think 50 Cent in the movie turned it into a big joke.