I recently came across this bizarre story in ‘londonist.’

Mrs Laursen and her husband moved into a new flat in London with their six domestic cats.

Strange to say whenever the cats were being fed a mysterious roar would echo around the apartment flowing down the corridor in which the cats were eating.

For a year it provided a bizarre form of entertainment whenever vistors arrived at the flat.

The obvious question that sprung to mind was had a big cat escaped from a zoo or was it some kind of supernatural phenomenon?

The couple eventually moved on. They were never plagued by the sound again.

londonist
The Saturday Strangeness (Disembodied Roar Article117) dated August 8th 2009.
Available at http://londonist.com/