1. mecha-hitler
Hitler's desiccated brain, locked deep within a monstrous robot with which he uses to wage war upon freedom, mercy, justice, Poland, and general minorities. Pretty effing big, but tends to hide within his hidden base in some country in South America. Similar to a Dreadnaught, but bigger and with more flamethrowers.
The city crunched and burned before the effortless wrath of Mecha-Hitler...that is, until the Hebrew Hammer arrived in time to save the day!
Or... Wolfenstein 3D's boss. Or whatever wolfenstein game it was.