almost a super villian

Captain Killdozer - Marvin Heemeyer
angry over a dispute over land with a cement manufacturing plant Heemeyer built an armored Komatsu D335A bulldozer outfitted with armor plating over the cabin and engine. outfitted with onboard cameras and monitors in the cabin, nearly airtight to resist a potential gas attack and had air conditioning, food, water and life support. outside, the bulldozer had .50 caliber semi-automatic rifle mounted on the back, and three other semi-automatics mounted

"Heemeyer took his machine of insanity out for a spin on June 2, 2004 by crashing it through the wall of his workshop. He then plowed through the concrete plant, the town hall, the local newspaper, a judge's house, a hardware store owned by a guy who had pissed him off, and seven other buildings, causing about $7 million in damages.
The bulldozer, which came to be known as the Killdozer since that really is the only appropriate name for it, was hit with over 200 rounds of ammunition and three small explosions that barely left a scratch on it.

Eventually the Killdozer got stuck in a basement and the engine failed. A single shot was heard in the cabin. While Heemeyer took the easy way out, and it still took authorities twelve hours to cut their way into the machine. Surprisingly, Heemeyer had not rigged the dozer to then self-destruct and destroy the entire town."