Commuters could have been forgiven for thinking they were still dreaming this morning.
As they passed through London Waterloo station on an early Monday morning, they came across a giant marshmallow man coming through the floor of the station.
People stopped to pose with the scary creature, otherwise known as the Stay Puft Marshmallow Man from the Ghostbusters franchise.
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There was also slime dripping from the ceiling of the popular commuter station, and a Ghostbusters shop.
The station's latest additions were installed to advertise the latest Ghostbusters film.