Berra's Law: You can observe a lot just by watching. - Yogi Berra
Bierman's Laws of Contracts: (1) In any given document, you can't cover all the "what if's". (2) Lawyers stay in business resolving all the unresolved "what if's". (3) Every resolved "what if" creates two unresolved "what if's".
Billing's Law: Live within your income, even if you have to borrow to do so. - Josh Billings
Billings Phenomenon: The conclusions of most good operations research studies are obvious. - Robert E. Machol (The name refers to a well-known Billings story in which a farmer becomes concerned that his black horses are eating more than his white horses. He does a detailed study of the situation and finds that he has more black horses than white horses, Machol points out.)