Hitler's Efficiency

Alright, listen up, chucklehead! This "joke" is playing on words. You see, instead of saying "Hitler was known for his exceptional COST efficiency", it replaces "cost" with "caust" (as in, caustic). "Caustic" can mean corrosive and refers to the effect of using very harsh chemicals, which is a dark reference to the Holocaust (you may need to look that up). It's funny because it's terrible, and you probably have a small brain.