A plane was delayed for five hours after it was forced to divert to Manchester airport after all the toilets were blocked.
The flight from Toronto to Pakistan had no choice but to stop off in the UK after "someone had thrown something solid down one of the toilets, putting all of them out of action", the Daily Mail reported a witness saying.
The diversion and delay didn't go down very well with either the passengers onboard or the chairman of Pakistan International Airlines, which carried the flight.
In a statement, Muhammad Azam Saigol said: "I am of the view that passengers need to strictly adhere to and carefully read the warning signs in the toilets!"
The Boeing 777-200 had left Toronto and was heading for Lahore in Pakistan when the problem was discovered mid-air over the North Sea, about 200 miles from Manchester.
PIA Pakistan tweeted: "Today's Toronto-Lahone flight has been diverted to Manchester as its toilets got choked, due to something solid thrown by passengers."
"As all toilets are connected with a common drain line, the rest of the toilets were choked."
"Keeping in view the convenience of passengers, the flight has been diverted to Manchester where the toilets will be serviced before the flight continues its onward journey. Inconvenience to passengers is regretted."
The plane took another hour to reach Manchester and then was on the ground for another three hours before it could take off again.
Passengers eventually reached Lahore with a delay of five hours.