New video has emerged of the awkward – and hilarious – moment a student is caught watching pornography during a lecture because he forgot to plug his earphones in.

The unnamed man had been sitting quietly in a lecture at Sydney’s University of NSW with his headphones on while he tapped away at his laptop.

But while the lecturer is explaining his PowerPoint slides in front of hundreds of students, erotic noises suddenly fill the room.

Sounds of amorous gasps and screams from the porn film echo through the lecture hall while the students erupt in laughter.

Meanwhile, the man on the laptop appears totally unaware as to why the others are laughing.

Finally, he catches on, and starts tracing the chord on his headphones back to the laptop – at which point he receives another huge laugh.

He attempts to plug the earphones into the machine a couple of times before slamming the computer shut and storming out of the lecture hall, visibly stunned and embarrassed by his clumsy ordeal.

However, all is not what it seems, with the whole episode a stunt designed to fool his fellow peers.

The video, which was recorded by Jamie Zhu, has attracted more than 11,000 views since it was uploaded onto YouTube on May 7.