Sarcasm's law: without a tell, it doesn't always come across as sarcasm without common sense. The latter is often missing these days, hence Poe's law.

internet's law: The average level of common sense, intelligence, sense of humor, benefit-of-the-doubt, and decency decays over time.

airhead's law: Quality sarcasm poetically-highlights an insight rather than ejaculates (meaning no. 2) a humorous quip.