Nothing better than sitting in the back on an MD-80 with the engines out of sync at midnight over the Gulf of Mexico trying to get your crew rest while part of a heavy crew doing the SFO-Cancun-SFO trip.
Better yet, try riding in the back of a hush kitted DC-9. It might be quieter on the outside but that's not true on the inside.
I remember the first time I rode on an F-100 thinking how much quieter it was than a DC-9.
Typhoonpilot