I just saw an article about Zimbabwe issuing a 100 billion dollar bill.
No, that is not a typo.
Yes, it says 100 billion dollars.
Here are three good reasons why this is a bad idea:
1. That's one piece of money you don't want to accidentally put through the wash.
2. Sucks if you lose it.
3. How on earth could you ever cash the thing? There will be signs at every store reading "We cannot break $100 billion dollar bills here, fool".