I was referring to CVE-2010-5139. Essentially somebody discovered that they could craft a transaction that caused a crazy number of Bitcoin to be introduced to the chain at that transaction, and used this to credit themselves on the main network. At that point the the exploit was patched and a new chain formed back before the transaction occurred, orphaning it in the process.

The developers don't seem to want to talk about it, but there's an original thread on bitcointalk.org that details the network event. https://bitcointalk.org/index.php?topic=822.0

ED: I got the number wrong above, it wasn't 32M BTC but 92,233,720,368 BTC