For years scientists thought they knew what caused the hole in the ozone layer but now it appears they could have been wrong.
It may have been "arseholes" that were responsible for the problem.
That was the answer given by one university student in an exam paper, according to his tutor, who suggested the befuddled scholar may have been thinking of "aerosols".
And historians may be questioning all they know about Hitler's role in World War II after one student reliably revealed the dictator's role in the conflict "is often overlooked".
These are among the bloopers submitted by university lecturers to the Times Higher Education magazine's annual exam howlers competition.