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The “Sometimes Reasonable Men Must Do Unreasonable Things” flag is a modern internet meme flag referencing the figure commonly known as the Killdozer Guy, a nickname associated with Marvin Heemeyer and the heavily modified bulldozer used during the 2004 Granby, Colorado incident. The flag features a black field with a stylized illustration of an armored bulldozer equipped with a front blade and protective plating. Above and below the vehicle appears the phrase “SOMETIMES REASONABLE MEN MUST DO UNREASONABLE THINGS,” a quote widely attributed in internet culture to the individual involved in the event. The design typically uses high-contrast gold or yellow graphics and lettering against the dark background, emphasizing the industrial imagery and the stark tone of the quotation.

The flag emerged primarily in online communities and meme culture during the 2010s and 2020s, where the Granby incident became a widely discussed subject across forums, documentaries, and social media. In this context, the bulldozer illustration and accompanying quote are used as a symbolic or ironic commentary on personal grievance, defiance against perceived injustice, or extreme protest. As a result, the flag is generally categorized as a meme flag rather than a traditional heraldic or political banner, circulating mainly as novelty merchandise, digital artwork, and internet satire tied to American contemporary folklore surrounding the so-called “Killdozer” story.