According to The Irish Times, the Road Safety Authority has had to contact 1,216 people that took their test since June this year...
Due to a technical glitch in the test correction system, a correct answer was marked incorrect. This unfortunately meant that 1,216 failed their theory tests with one wrong answer.
The Road Safety Authority have contacted everyone affected by this error, and so far 610 of them have already retaken the test.
Now, there's a bit of vindication for the "I coulda sworn I passed!" crew.