Notorious Software Errors

Denver baggage handling system - was so complex (involving 300 computers) that the development overrun prevented the airport from opening on time. Fixing the incredibly buggy system required an additional 50% of the original budget - nearly $200m.
The 2003 North America blackout - was triggered by a local outage that went undetected due to a race condition in General Electric Energy's XA/21 monitoring software.
FBI in 2005 - $170 million FBI project to update their case management system.

Denver baggage handling system - was so complex (involving 300 computers) that the development overrun prevented the airport from opening on time. Fixing the incredibly buggy system required an additional 50% of the original budget - nearly $200m.