The Law of Exclamation is a comedic principle stating that the more exclamation marks a person uses, the more likely they are to be mentally unstable. Often attributed to author Terry Pratchett in his Discworld series, the law famously suggests that five exclamation marks are a sure sign of someone who wears their underpants on their head. In the digital age, this meme has evolved to mock unhinged social media posts, frantic corporate emails, and the general 'shouting' energy of the internet. It is a favorite among grammar enthusiasts and those who appreciate the subtle art of satirical observation regarding online behavior.