We movie-goers are an impressionable lot. We like to associate ourselves with our screen heroes; wear our underwear on the outside and whack each other around the head with plastic lightsabers. But although imitation may well be the most sincere form of flattery, we're not just talking about tracking down t-shirts and trainers on eBay. We're thinking on a much bigger scale. Sometimes the effect is obvious. For example, most Bond films are glorified car commercials. Indeed, such was the demand for a shiny new Lotus Espirit (having featured in The Spy Who Loved Me) that, upon the film's release, customers had to sign up for a three-year waiting list. Likewise, Marlon Brando's sultry performance in A Streetcar Named Desire helped to hawk hundreds of thousands of t-shirts. Presumably, customers had to provide their own sweat, muscles and brooding sense of masculinity. But other trends are less easy to spot. Who knew what kind of impact Dennis Hopper, say, could make by having a psychosexual monster such as Frank Booth declaring his fondness for Pabst Blue Ribbon? Or Tallahassee's (Woody Harrelson) obsession with Twinkies? Below are the lesser-known commercial implications of some of our best-loved films. Enjoy!