If the Flyertalk tags don't give it away, the Northampton Little League or <customer> READY MIX baseball cap should.
I also trawl for Elites. When sitting in FC, if I catch the boarding pass for a seatmate and it shows status, I'll ask if they know about FT.
On my last trip, I was sitting with a guy who was clueless about Elite. He'd purchased an E-Ticket and was shocked to get a FC boarding pass. He'd booked 17F or something. I gave him the website so he can see the light.
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"I will not be pushed, filed, stamped, indexed, briefed, debriefed or numbered. My life is my own."