This is the disgusting moment a business class passenger was seen using his feet to operate a touch-screen TV.

Onlooker Ruby Chou noticed the traveller browsing movies by swiping his toes on the monitor during the EVA Air flight BR129 on August 9.

Footage shows the man resting his right foot on the TV attached to the back of a seat while searching for a film to watch as the cabin lights were dimmed midflight.

The more-than-two-hour flight from Osaka, Japan, to Taipei, Taiwan, left Ruby in shock after witnessing the unhygienic behaviour onboard the Boeing 787.

Ruby said: 'Most people in the cabin were already resting when it happened, and the lights were off. I didn't confront him. No words, no conversation—just the shock in my heart. Quietly, this moment stays in my memory of the return trip.'