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When I say “DieHard,” what do you think? Probably “one of my favorite Christmas movies” and “why isn’t there a space between the words?” To answer your question, it’s because, in this instance, the term refers to the brand of wiper blades on sale at Amazon for as low as $4. They may not be one of the most fun things to shop for, but they’re definitely useful as far as helping you stay alive when you drive in the rain, which makes 50% off look like a pretty amazing bargain.