A fed-up teacher caught out 14 students cheating in their final exam with a cunning question.
The clever test has gone viral on Reddit after the suspicious university tutor caught wind of students regularly exiting exam halls en masse to visit the toilets.
Rule-abiding students were left “irritated” by the blatant cheating so the teacher came up with his plot – which involved posting erroneous information online about the question.
Writing on Reddit, one person taking the engineering test explained how they had personally found part A of the question easy, but part B impossible.
They said: “He purposely made part B impossible to solve, and about a month before the final he got a teaching assistant to ask the exact question [online], which was distinctly worded to be unique.