(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 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.

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