The movie itself focuses Damon as he works for Nicholson, but infiltrates the State Police, and Leonardo DiCaprio, who is working for the State Police but who infiltrates Nicholson's crew. The film revolves around each "rat" trying to figure out who the other one is, and is a great ride all the way. It won awards, and was recieved with overwhelmingly positive reviews by critics. The film's theme focus on the line between authority and vigilante, cop and criminal, especially during the third act.
2. A film with possibly more usage of the word "fuck" than many films put together
Billy Costigan: Nobody's fucking searching me, search me for fuckin what?
Frank Costello: Contra-fuckin-band, take off your fucking shoes
Billy Costigan: Fuck you! Fuck you, I'm fucking arresting you!
Ellerby: Fuck yourself.
Dignam: I'm tired from fucking your wife.
Ellerby: How's your mother?
Dignam: Good, tired from fucking my father.
French: Fuck it!
Billy: Where the fuck were you?
Delahunt: You're fuckin late, get in the fuckin van!
Sullivan: Just kill me! Just fuckin kill me!
Dignam: Whoop-dee-fuckin-do, you're no fuckin cop!