The phantom glass is a spectacular phenomenon that occurs when a warm glass placed upside down on a wet surface starts moving on its own, as if propelled by an invisible force. We show that this spontaneous motion is the result of a transition between solid and liquid friction regimes due to a pressure increase in the glass. We reveal the existence of three phases in the dynamics of the system when the temperature of the glass is increased: Firstly, we observe an expulsion of liquid trapped inside the glass followed by a lift-off of the glass that eventually floats over a capillary bridge preventing air from escaping. Finally, when pressure is increased even further, the bridge breaks up and solid friction is restored.