Framed as a love story, it's set during a single night in LA as a man accidentally picks up a ringing pay phone and hears what seems to be a soldier who has misdialed his father and calling to warn of an impending missile launch.

It's an incredibly tense film as the man anguishes about whether the phone call was fake or not, and decides to make an attempt to get out of town, but not before getting his girlfriend. It doesn't have the documentary realism of Threads, but the atmosphere of dread is a fantastic, and the structure -- a long "After Hours"-type night of craziness while nuclear holocaust is looming -- is pretty unique.

[1] http://m.imdb.com/title/tt0097889/