FIEDLER'S FORECASTING RULES
1. It is very difficult to forecast, especially about the future.
2. He who lives by the crystal ball soon learns to eat ground glass.
3. The moment you forecast, you know you’re going to be wrong--you just don’t know when and in which direction.
4. If you’re ever right, never let them forget it.
(Edgar R. Fiedler, economist, quoted in The Official Rules, Paul Dickson)