I have had a few planned rendezvous with ladies from FF and I have also experienced two accidental run-in's with fellow FF members that I recognized and they recognized me.  
The first run in was about six years ago while I was at work and I traveled to Boca Raton for a business meeting. A lady that worked for the company I was making a presentation too walked into the conference room, pointed at me and said; "Hey, you're  stomachstretcher"!  A few other people heard her and that caused a little embarrassment.  More for her than to me.
The second time was at a local mall.  That was a nice and pleasant encounter!
      
      
    11 years