In this thread
http://boards.straightdope.com/sdmb/showthread.php?s=&threadid=221105 there’s some minor hijacking going on about identifying yourself to other dopers. The OP suggested going table to table at a wedding asking, “Do the words ‘Hi Opal’ mean anything to anyone”?
I thought about this some time ago and came up with, “Does anyone here know Cecil Adams”? Those who responded “Yes” could then ignore me in real life.
So if you were mingling amongst strangers, and wanted to find out who might be a doper, what would be your doper-seeking line?