I said it once, and I’ll say it again: circular needles are an excellent impromptu garrote
Under what circumstances did you need to say it the first time???

The Telegraph – By Molly Oldfield and John Mitchinson
During the Second World War the Office of Censorship banned people from posting knitting patterns abroad in case they contained coded messages. There was one occasion when knitting was used for code. The Belgian resistance recruited old women whose windows overlooked railway yards to note the trains in their knitting. Basic stuff: purl one for this type of train, drop one for another type.