Keep calm and cast on. A fun knitting take on the old Keep Calm and Carry On poster from the 1930s. We added a ball of yarn and some knitting needles, and updated the text to read KEEP CALM AND CAST ON. Great gift for anyone who loves to knit! .Available on over 50 t-shirt and apparel items for adults and kids, as well as on knitting bags, cell phone cases, mugs and drinkware, ties, and gifts of all kinds. Copyright Scarebaby Design.