An e-mail:

As a conservative in Berkeley, I can attest that there is definitely a need for a secret sign to recognize other conservatives (who should all be reading The Corner, of course). A heartfelt wail of “Menndozzzaaa!” would surely alert other conservatives within a few blocks, but it would hardly be subtle. Then again, in Berkeley such outbursts attract little attention. Perhaps a more discreet signal would be to work the phrase “On account of the flies” into a conversation. It’s surprising how easy it is to slip in; I provide a snippet of dialog as an example:
Berkeley hippie: “Why were you shouting ‘Mendoza’?”
Crypto-conservative: “On account of the flies.”
Berkeley hippie: “Oh. Would you like to donate to the fund to Recall Schwarzenegger, Get Israel out of Palestine Now, and Defend Affirmative Action By Any Means Necessary?”
Crypto-conservative: “No thanks.”
Berkeley hippie: “Is it because I’m a lesbian?”
I haven’t yet decided on a counter-sign for answering “on account of the flies”. Perhaps the first few lines of Dragostea Din Tei (the “Numa Numa” song).