The guy was sitting on his motorcycle with other riders talking to Alexandria cops, looked about 50-55 or so. The back of his T-shirt said "Alexandria Motorcycle Police" or something like that, and he was chummy with the cops, so I can't verify true unicorn status, but he wasn't in any uniform and had a gray beard.
I rode my bicycle past him and circled for a second pass. So which one of you was it?:celebrate