Friday's AS-level chemistry exam had students believing they were sitting a physics paper instead.
Post-exam Twitter was lit, as sixth formers took to social media en masse to console each other and complain.
Although it's true the two branches of science share the study of matter, students were still perplexed, and more than a little annoyed their preferred topics didn't appear.
The test just wasn't what people needed right now.
The pun game was strong.
'All I could say was add water and shake'.
Last week, students reacted with utter dismay after their AS-level Maths exam left them confused and more than a little irritated.
Some even declared the paper had “destroyed” their future.
Those sitting the Edexcel C1 test said it was “harder than all the past papers” and didn’t include as many whole numbers as was expected.
At the time, Pearson Edexcel said: “With every paper there there will always be questions that some students find difficult, which is often reflected in social media comment.”
Earlier, those sitting the AQA Biology GCSE were left furious after the paper asked them what an independent business was.
Previously AQA said: "Exams aren't meant to be easy."