Following President Obama's speech to a joint session of Congress on September 9, 2009, the Wikipedia entry for Representative Joe Wilson of South Carolina underwent rapid change. Congressman Wilson had just shouted out words to the effect of "You lie!" when—during the president's speech—Obama said the current proposals would not provide health insurance to illegal immigrants. (factcheck.org backs the president's claim).
Below are a few screen grabs of the introductory section of Wilson's page (with relevant text highlighted). (The editing function on the page was ultimately—temporarily—disabled, as per Wikipedia policy. For more detail, see the page's history).