(NEWSER) – Two passengers who seemed to have been having tough travel days took the rest of a United plane down with them over the weekend. It all started when a man hooked a device called the Knee Defender(seen in the photo below) to the seat in front of him, thereby preventing the woman in front of him from reclining her seat.

The device, which is marketed as helping fliers prevent injury, is banned on United, and a flight attendant asked him to remove it, but he refused. That's when the woman in front of him stood up and threw a cup of water in his face, reports the AP.

The flight, which was on its way to Denver from Newark, NJ, was diverted to Chicago's O'Hare, where police escorted the dueling duo, both 48, off the plane and let the rest of the passengers get on with their day. (They arrived in Denver almost two hours late.)

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