The Killdozer meme refers to the June 4, 2004, rampage by Marvin Heemeyer in Granby, Colorado, where he used a custom-armored Komatsu D355A bulldozer to demolish buildings following a zoning dispute. While the event was a destructive criminal act, internet culture—particularly libertarian and anti-authoritarian circles—transformed Heemeyer into a folk hero. The meme often features the phrase 'Sometimes a reasonable man must do unreasonable things,' symbolizing a breaking point against perceived bureaucratic oppression. Today, the Killdozer image is used to represent extreme frustration with government or corporate entities, often appearing on anniversaries of the event as a symbol of defiance.