If you want to know if someone is "real" tell them an obvious lie. A human will recognize it for what it is immediately, a cursed will not. They may look real, but they are not. Only real eyes realize real lies.
My most favorite quote of ALL TIME by Tupac, should read ".or you can just leave the pieces on the floor and move THE FUCK on." explicit but rolls off the tongue better once you finally get to that point.