A few samples, from a list at S,C&A:
Weinberg’s Law: If builders built buildings the way programmers wrote programs, then the first woodpecker that came along would destroy civilization. (Gerald M Weinberg)
Jakob’s Law of the Internet User Experience: Users spend most of their time on other websites. (Jakob Nielsen)
Ellison’s Law: The two most common elements in the universe are hydrogen and stupidity. (Harlan Ellison)
Clarke’s Third Law: Any sufficiently advanced technology is indistinguishable from magic. (Arthur C. Clarke)