It has amused when someone has pulled that kind of vigilante enforcement in the airport, at a hotel, or even concert venues I've frequented and I've just bit my tongue only to have the agents/ushers/ call me forward me by name... the expression on some faces is so worth it. (You may not know who I am but the people I care about do ). This 'do you belong here' from random strangers has decreased in inverse proportion to the number of grey hairs I've picked up at my ripe old 37. And just noticed a couple of the airport concessions have started giving me an "Airport Employee Discount"... not sure what that says about me now