In the plastic tube Sir, it's the first door on the right, end of the corridor....
It might help if you were a little more specific...
You don't do a PA for no reason, 'hello ladies and gentlemen, we're at our cruising altitude of 31,000 feet and I know you're trying to sleep but I'm a bit bored up here and my wife just doesn't understand me...It all started when I came home and saw the milkman's cart on the driveway...'
Depends what's happening, could be turb, bad WX ahead, fasten belts etc, route info, pretty things to look out the window for, help with 5 across on the Times Crossword....