The 'I'll Tell Carl Bismarck' meme is a niche historical humor trope that parodies the stern, authoritarian reputation of the Bismarck family. It typically features a character threatening to report another person's minor social or political transgressions to a member of the Bismarck lineage, often playing on the 'Iron Chancellor' persona of Otto von Bismarck. The meme evolved within history-centric internet communities where users juxtapose high-stakes 19th-century European politics with petty, modern-day grievances. It is frequently used to mock people who act as self-appointed 'enforcers' of rules or to highlight absurdly dramatic reactions to small mistakes.