5. Withnail & I (1987)
The film: The brilliantly grotty and British tale of two down-and-out actors - full-time alcoholics, part-time performers - and their attempt to enjoy a short break in the country. An enduring smash thanks to a) the characters' non-stop drinking, and b) their beautifully captured youthful, co-dependent relationship.
Join the cult: Do a location tour like doc filmmakers Mark O'Connell and Richard Sparks ("We've gone on pilgrimage by mistake!"). Their journey is now an extra on the 20th Anniversary DVD, and a website with info is up here.
4. Fight Club (1999)
The film: Searing pre-millennial shot at capitalism. celebrity and the flabby cosiness of modern living, that seduced a generation of cinema-going men with smart anti-slogans and sleazy bohemia (and a subconscious desire to look like Brad Pitt, of course).
Join the cult: It's influence on men of a certain age was huge. Real fight clubs were founded, and a vicious, still popular celebrity blog took its name (and early attitude) from the film. Instead of punching people or starting an anarchist terrorist group, though, we'd suggest just to listening to the pixies and buy fight club soap.
3. Quadrophenia (1979)
The film: Angsty Seventies gang-and-romancer Quadrophenia made being a Mod cool again a decade after the event, full of sharp suits, gleaming scooters, and the awkward trials of teen tribalism.
Join the cult: Buy a scooter with 27,000 mirrors on it and take part in a Mod revival weekender like this one.
2. The Rocky Horror Picture Show (1975)
The film: Astronomically camp and insanely catchy stage-musical-turned-midnight-screening-phenomenon, filled with enough debauchery, double entendres and giant codpieces to fuel over three decades of fan frenzy.
Join the cult: Screenings are still common, with audience participation and the wearing of fishnets very much expected. Check the official site for times and locations.
1. The Big Lebowksi (1998)
The film: A deliriously chilled whoddunit featuring the most lackadaisical detective of all time - The Dude - who cruises crustily through life in suburban LA bowling, smoking, and generally taking things easy. Jeff Bridges' inspirational slacker turn and his awesome accessories (dressing gown, sandals, White Russian cocktail) have spawned an entire fan industry.
Join the cult: If mixing up a White Russian at home isn't enough (one part vodka, one part coffee liqueur, one part cream), then why not book tickets for the next Lebowski Fest, a two-day celebration featuring a movie screening, bowling session and frequent star appearances.