Was on a business flight a few years ago. Left Denver, plane almost empty. About 10 minutes in, a small boom and suddenly we were flying at an angle. Very obvious. No other passengers noticed! A short while later, we turned back to Denver. No big deal.
What little I know about flying twins says that the first things you do if you lose an engine are get the nose down and bank into the good engine, while pulling back the throttle on the good engine. Exciting for a commercial passenger, of course. Then ease the power back up. Twin engine airliners can maintain altitude indefinitely on one engine.