I learned that the hardest party to pull off successfully is Saturday night dinner. This meal is expected to be elaborate: appetizers, first course, dinner, dessert, and coffee. People arrive at 7:30 or 8 p.m. and stay for hours - definitely past my bedtime - and they all go home exhausted.
For years, I've been wondering what could happen to nuclear submarines when they dive and disappear from the surface of the earth for months, without a trace. No one really knows where they are.