Your computer is no match for the competing computers. Always know where the escape hatch is for each and every trade. Motorcycle drivers who stay afraid of their machines die of old age. Those who think they're Evel Knieval die horrible deaths. Check your machine before you drive it, and stay alert.
Freight trains do come roaring across unmarked crossings.
The market is a mechanism for transferring wealth. It does so by causing pain. Great wealth transfers in times of great pain. Losses are a way of causing pain. Card sharks operate by letting the sucker win big in the early going.