For me the strangest form of fiat currency is the ones affected by hyper inflation. Like in Venezuela for example where the value is changing weekly and you can't basically buy anything anymore with cash. When you have to use a one year salary from a few years back to buy a meal right now. As no intrinsic value is in the paper money and trust factor of the government is at 0 just shows us how bad things can get when only relying in fiat currencies.. Most of the payments are done online now in USD or other major currencies. I would not give my crypto currencies back for any fiat's.
I have a little panel, hanging on the wall directly behind my desk at home, with a 100,000,000,000 USD from Zimbawe. One identical to the one PlanB sports in his Twitter cover picture.
IT is just a memento about not trusting central bankster.