The tourists waiting at Lisbon Airport could not believe their eyes when instead of flight information, they were treated to an X-rated movie.
One of the passengers naturally decided to film what he was seeing on his mobile phone and uploaded the footage online.
The clips clearly shows the film in all its detail, while passengers can be heard laughing in the background.
A spokesman for Lisbon Airport insisted the broadcast was not a deliberate act by a disgruntled employee.
He said: “At 3 am on October 19, along one of the luggage mats from Lisbon Airport, a TV was tuned [without sound] to a Portuguese generalist channel [this is not a porn channel], but at the time ran a soft porn movie.
“The situation was corrected promptly. There were no complaints. We will ensure that these situations are not repeated.”
The video is said to have stayed on screens for several minutes.