Among the superstitious, it is said a resident ghost in a theatre is a sign of good fortune.
If that's true then Tottenham Court Road's Dominion Theatre may be one of the luckiest theatres in London after a photo has emerged of a supposed ghost lurking in its stalls.
Dominion Theatre visitors with an unexpected photo-bombing ghost.
Irrefutable proof of the afterlife? Add the real life events surrounding the site of the theatre, and you have what may be a compelling case.
History tells of a terrible disaster 114 years before the Dominion was built, when the Meux and Company Brewery occupied the same site as the present building.
On 17 October 1814 a huge vat containing 3,550 barrels of beer - over a million pints - ruptured, causing a tsunami of alcohol to sweep the area, flattening buildings and killing those in its path.
An eyewitness wrote in New York magazine The Knickerbocker: "All at once, I found myself borne onward with great velocity by a torrent which burst upon me so suddenly as almost to deprive me of breath. A roar as of falling buildings at a distance, and suffocating fumes, were in my ears and nostrils."
Eight people drowned in what became known as the London Beer Flood.
Is this a photograph of one of the poor unfortunate souls claimed by the worst industrial alcohol accident in British history? Or simply a fake? Take a closer look...
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