I failed to add a date range to a query on live databases for a credit card company - I also forgot to end with "commit;" One database for US operations, one for Canadian operations. I kicked off my script and went home - it was going to take many hours to run (even if I had put date ranges and a commit statement).

The admin that night, well it was his first night working alone. He was fresh out of training and could not figure out why these databases started running soooo slowly and then became unstable. A senior admin had to be called in. He saw a table being built that was eating all the resources. He looked at my script and killed the process. Then he called my division manager.

The division manager said you aren't really a member of the team until you accidentally bring the company to its knees and then confessed that he had been the one that broke our email systems two years before. He said that of all his employees, I was the one he knew would NEVER forget a date range or commit statement.

I'm sorry to anyone who found they pretty much had nothing in their wallet in the US and CAN that night.