Inspired by the "cheapest thing" thread, and its many comments involving CFs, I have a genuinely burning desire to know if anyone has ever got one up on a CF who had previously taken advantage of them, whether from MN advice or off their own bat.
My own example involves the usual "split bill" scenario: 5 people had wine, starters, and dessert, and 3 (one of them me) had a soft drink and only a main course. When the bill came there was no suggestion whatsoever of not splitting it equally. I didn’t say anything at the time as I was too embarrassed, and didn't know the CFs well, or want to make it awkward for the organiser. Recently, though, another dinner was organised, and I found myself busy and unable to attend. I will always be busy for future proposed meals with this particular group. Not brave, I realise, but it still feels like a win to me.