Because the value of the German currency was plummeting at such an absurd rate, everyone had to attempt to learn advanced mathematics just to calculate the cost of a loaf of bread (which at the height of the troubles could have cost thousands of billions of marks). The effect was that people actually began to grow so dizzy from all the zeros they had to write down every day that it drove them slightly crazy. Imagine being unable to sleep at night because your brain is compulsively counting dozens of zeros and you can't stop.
Cashiers, bookkeepers, and bankers were most prone to this affliction. Besides a compulsion to write endless strings of zeros, individuals who suffered from this condition would reportedly become confused when referring to numbers and would state that they were 10 billion years old or had 40 trillion children.
"Hey, you 3 sextillion kids back away from my money bricks! Those are for repairing the roof."