It always confuses people when you have a paid for ticket and in full uniform. It is a concept that the passenger crowd can't fathom.
If my ticket isn't first class in the USA, I am in uniform so I can board early and find space for my bags. If it is a first class ticket, I am dressed like Ricky from Trailer Park Boys, and my ID only comes out for discounts and KCM.
If you really want to confuse people, show up in uniform as a pax in Asia.