Some laws

Murphy's law is an adage or epigram that is typically stated as: "Anything that can go wrong will go wrong." In some formulations, it is extended to "Anything that can go wrong will go wrong, and at the worst possible time."

Occam's razor, Ockham's razor, or Ocham's razor (Latin: novacula Occami), also known as the principle of parsimony or the law of parsimony (Latin: lex parsimoniae), is the problem-solving principle that "entities should not be multiplied beyond necessity"

Parkinson's law is the adage that "work expands so as to fill the time available for its completion." Corollaries are below: 

If you wait until the last minute, it only takes a minute to do! Work contracts to fit in the time we give it!! Data expands to fill the space available for storage.!!!