I once helped a member of CC sell an Empower adapter (she asked me to explain to another pax how it worked) in CW and was given a thank you bottle of champers on arrival.
Another time CC opened a new bottle of wine for me even though I said I'd have something else to avoid wasting the rest of the bottle. Rest of said bottle was re corked and handed to me on arrival.
Both were on UD and strangely enough both involved alcohol...