Passengers occasionally bring cups and other trash back for me to dispose of as they head to the toilet but the remainder of the long flight is a coffee break of sorts for us. Service in first class is usually more involved. With 12 or fewer passengers on the smaller jets, it also tends to be more intimate. No carts are needed, and food and beverages are presented in china and glassware. Various types of people fly first class, but that cabin mostly fills up with business people and other frequent flyers.
Celebrities occasionally make an appearance.
A friend served Sissy Spacek once, and another flew with the members of the Red Hot Chili Peppers. During the flight, a problem arises, which is relatively common on longer flights. Sitting in the back, I notice the smell of cigarette smoke coming from the lavatory. There is no sign of the cigarette in the trash, but I advise him that smoking in the lavatory is a violation of a federal law and comes with a large fine. There are set procedures to deal with situations like these and paperwork to complete.