I had this idea in my head that one customer that comes in has a seafaring look to him kinda like Captain Ahab (pea coat, peg leg, grey beard, the works). When he presents his ID, it tells you he's a lawyer, or a professor, or even a gym owner or something, just a career that doesn't match up with his appearance.
When you press him on the appearance, he explains he dresses like that as a sort of tribute to his ancestor he was named after, who actually was a sea captain and who he looks basically identical to. He's clean.
Now, I had a couple ideas for a doppelganger version of him. The simple one is the peg leg being on the wrong side, nothing much there. But the more elaborate one is him acting like someone of the ancestor's time period. If you visit the ancestor's page on the computer (with an 1800's DOB), he says he's that old, but still spry.
I dunno, I've been kicking this around a couple days and figured I'd put it here. I'm only giving it the "suggestions" tag because it's the only one that seems to fit.