Having enough network traffic to bring down your server is normally a "good" problem to have, but the side effects of Knight Capital Group's servers going ballistic, I'm sure, are not remembered fondly.
45 Minutes of Hell - Imagine what would happen if you had a system capable of sending automated, high-speed orders into the market without any tracking to see if enough orders had been executed. Yes, it was that bad. When the market opened at 9:30 AM people quickly knew something was wrong. By 9:31 AM it was evident to many people on Wall Street that something serious was happening. The market was being flooded with orders out of the ordinary for regular trading volumes on certain stocks. By 9:32 AM many people on Wall Street were wondering why it hadn’t stopped.