In movies like “The Shining” and “Carrie,” blood came by the buckets. But perfecting that red gooey mess took a long time and several different recipes. From melted insects, to chocolate syrup, to a carefully concocted poisonous substance, fake blood has come a long way. These days, much of the fake blood you see is computer generated. But if you want to go the old-school route, you’ll need insects or poison.