If anything can go wrong, it will

Murphy’s Law: If anything can go wrong, it will. (In Deffeyes, 2003)

石油井转取工程师，Deffeyes’ Rule (K. S. Deffeyes, 2003): if even one thing goes wrong, you get a dry hole.

结论：一个小错误就足以带来莫大损失/终生的懊悔。正所谓：“差之毫米，谬以千里。”