What in the world is detecting narcissism? Human psychology is way more complex than that. Do you really think that you can "detect" very serious personality disorder by asking one silly question?

What if someone is competitive and he says that he wants to be the best. It doesn't mean he's a narcissist. The man can be a great guy outside of place where he compete with others (like work). Your topic kinda reminds me all those guys who sell best pickup lines THAT WORK ON EVERY GIRL. It doesn't work like that