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It came out of the blue! But where did that idiom come from? The phrase out of the blue means without warning and completely unexpected. It is from a bolt out of, also from, the blue, describing a sudden and unexpected event, a complete surprise, with reference to the unlikelihood of a clap of thunder or a bolt of lightening coming from a clear blue sky. For example, The London Standard newspaper had the following on August 26, 1863: “Murder now rises up before us, gaunt and unmitigated, in a circle where all seemed lovely, virtuous, and peaceful. This is verily ‘a bolt out of the blue’—the lightning flash in a sunny sky.” Which brings me to a dad joke I saw recently; I just found out I’m color blind. I’ve got to tell you, that news came out of the purple!