A 1998 action/espionage movie directed by Tony Scott. It stars Will Smith as a DC labor lawyer who unwittingly holds key evidence to a crime that was committed by a high-ranking NSA official. Gene Hackman plays Brill, an ultra-paranoid and skilled ex-NSA spook who works from a copper wire mesh shielded HQ. Good stuff.

(Smith): What the hell is happening?
Brill: I blew up the building.
(Smith): Why?!
Brill: Because you made a phone call!

Enemy is basically a more modern North By Northwest. It also reminds me of Coppola's The Conversation (1974), in which Gene Hackman plays a quiet surveillance expert who becomes obsessed with the couple he is tracking.