How about 184 billion BTC? I know, the whole point is that there are only 21 million BTC, right? Well, on August 15, 2010, a bug in Bitcoin block 74638 accidentally created 184.4 billion BTC. The error was quickly fixed by Satoshi and the mining community.
However, this serves as a reminder that vulnerabilities can arise even in the most secure blockchains, especially in the early stages.$BTC