Students at a top university burst out laughing in the middle of an exam when they realised the answers were stapled to their test papers.
The first year exam turned into a shambles after a printing error resulted in the paper's mark scheme being attached to the back of the questions booklet.
It gave first year students the answers to the complicated test for 40 Electrical and Information Engineering pupils at Imperial College, London.
More top news
A luxury penthouse in Mayfair has just broken the record for the most expensive home ever sold in the UK
Simon Harris talks to the Labour politicians hotly tipped for the Mayoral race in 2016 - but only one will admit he is standing
ITV London's Political Correspondent Simon Harris takes a look at the Labour candidates vying for the capital's top job in 2016