Andrew Mitchell accidentally displayed his confidential briefing notes on Afghanistan to the whole world on Tuesday, after they were caught by an eagle-eyed photographer.
The document made reference to Afghanistan's President Karzai announcing he would stand down in 2014, saying: "This is very important. It improves Afghanistan's political prospects very significantly. We should welcome Karzai's announcement in public and in private."
But Mitchell is not the first, and is unlikely to be the last, visitor to No.10 to be caught out this way. Take a look at our slideshow below to see other political document gaffes.