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An embarrassed teacher scrambled to close down a pornographic movie that was showing on a big screen - after he accidentally starting playing the wrong film.
A huge projector screen, connected to the teacher's laptop, beamed the X-rated clip to the busy lecture hall full of students.
Some of the teenagers can be seen holding books up in front of their faces to block out the naked people writhing around on the screen.
The teacher, who had apparently left the room as the clip started, came back in the lecture hall as the jeers and laughter got louder.