From Harry Styles, to Dev Patel, to Jeremy Allen White dozens of celebrity lookalike competitions have popped up in recent weeks. But why are doppelgngers all the rage, when they used to be a sign of bad luck? Nathanil Siri and Edward Toledo are two lookalikes who say that they share similar interests and traits. However, a psychologist says not all doppelgngers share much in common aside from their looks.