Back in the early days, I noticed my town had a wikipedia entry, but no demonym (word for people who live there; e.g. New Yorker, San Franciscan). I thought of a slightly rude word whose first half happened to be my town's name (think if, say, Parisians were called "Parisites"), and added it as the demonym, totally unsourced, as a joke to show my buddy. It stayed. For a few years it stayed, never questioned. Then, the new Mayor used it in a speech; presumably, she'd looked it up on wikipedia. That speech was published in the local paper. The local paper was added to the page as a source, and not by me. A high-school gag between friends was now a sourced and cited fact.