In no particular order, here's our rundown of 20 of the best.

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Scott) and a fine control of portentous atmosphere.

The red ball bouncing down the stairs will stay with you. The Three Faces of Eve (Nunnally Johnson, 1957) Joanne Woodward – then virtually unknown in Hollywood – won the Best Actress Oscar for her ingenious triplicate performance, in this hokily compelling psychological case study about Multiple Personality Disorder, based on a real-life report. Black Christmas (Bob Clark, 1974) An underrated Canadian horror, pre-dating Halloween in the slasher cycle, about a sorority house fending off Yuletide attacks from a mad stalker. Rebecca (Alfred Hitchcock, 1940) Alfred didn't consider it a "Hitchcock picture", undoubtedly because David O Selznick wanted it made his way.

It may have been mundane, but this 18-second video revolutionized digital media in a way none of us could have expected.

With over one billion users and 300 hours of video uploaded each minute, it’s fair to say You Tube has changed the world.

In total, these channels had been viewed more than 37 billion times.

They looked at almost 13,000 videos watched by millions of youngsters that use You Tube as an alternative to TV and found many contained 'inappropriate' marketing content.

Cary Grant and Rosalind Russell are the divorced couple chasing the story of their lives, as a possibly innocent man awaits the gallows. M (Fritz Lang, 1931) Peter Lorre’s legendary performance, as a child-killer lurking in the harsh shadows of inter-war Germany, is especially provocative because it’s so daringly close to sympathetic. Romero, 1968) One of the great horror debuts of all time, and for many the definitive zombie movie, uncannily timed to comment on America’s Sixties culture wars. Ulmer, 1945) The most famous of all “poverty row” quickies – and at a brisk 68 minutes, it’s nothing if not quick.

Fritz Lang’s Expressionist masterpiece indicts mob rule whatever its target. The ending came to seem shockingly serendipitous when Martin Luther King’s assassination was announced. A Matter of Life and Death (Michael Powell and Emeric Pressburger, 1946) Powell and Pressburger’s shimmering afterlife parable was prompted by a government directive: to defuse tensions between native Brits and “overpaid, oversexed and over here” American servicemen. Carnival of Souls (Herk Harvey, 1962) Dreamlike terror on a tiny budget, from the neglected Herk Harvey, whose masterstroke was deploying the derelict Mormon amusement park in Saltair, Utah as a halfway house between life and death. Tom Neal is a shabby pianist hitchhiking his way from New York to Hollywood, and falling in with Ann Savage’s cigarette-puffing femme fatale. The General (Buster Keaton, 1927) Buster Keaton’s hurtling, one-man-and-his-train comedy about a Civil War railroad engineer contains the most sustained passages of virtuoso slapstick genius he ever shot.

Scientists from Harvard University and the Federal University of Minas Gerais, Brazil found the most popular channels had advertising content that was 'disguised as other content'.'Most of the digital services offered on the internet are advertising funded, which makes advertising ubiquitous in children's everyday life', researchers said in their paper 'Characterising videos, audience and advertising in Youtube channels for kids'.