Pretty, polite but uninformative...
While flying an internal flight in Japan, I was informed that a pax was being loud but was not told until we already had the engines started...
I went to see what was up and there was a group of fellows with a big bag of beer cans. One in particular seemed to be ringleader. I had a stern word with him and relieved him of the bag, which went into the fwd galley.
Throughout the flight I asked the #1 hostess if all was well and was assured that it was. After landing, she said "Yes, we gave him back his bag of beer and than he was OK!"
Japanese lessons:
Lesson 1. The customer is always right
Lesson 2. The cockpit crew has nothing to do with cabin matters
Lesson 3. We will tell you anything to keep you happy, even if it is not true
In a similar vein, I once caught the crew talking in our crew bus about a fire which they had extinguished on board - on the flight we had just done! We had a safety refresher there and then but I doubt it made much impression. "It was only a small fire and we didn't want to disturb you captain..."
FC.