A woman walks past a camera holding and talking into what looks like a mobile telephone.

An ordinary, every day scene - except this image was captured in 1928.

An Irish film-maker, George Clarke, says the footage is of a time traveller caught walking through a scene on a DVD of Charlie Chaplin's film, The Circus.

"The only conclusion I can come to - which sounds absolutely ridiculous I'm sure, to some people - is it's a time traveller," he says.

"When you're looking at a bit of 1928 footage with an old woman ... on a mobile phone, it's kind of strange. You can't explain it."

The scene can be found in the extras menu in Documents, under The Hollywood Premiere.

It is not in the film, rather it is a shot of a member of the public walking past the camera. The full clip can be viewed on YouTube.

Many sceptics have said it would have been impossible to use a mobile phone in 1928 due to there being no networks built to support them.

Others say this: She is a time traveller - whatever she has in her hand would probably not use technology common in 2010.