One of the quintessential haunted-house staples has got to be the red stuff. There are a handful of simple techniques for replicating lifelike blood, but why not go for the yummiest version? Begin with a clear or light gold corn syrup and gradually add red food coloring. For an authentic bloody hue, incorporate some blue dye to bring down the brightness. Thicken the mixture by adding chocolate syrup. Remember to add each ingredient in small quantities to avoid oversaturation.