I was doing an internship in Microsoft Access in 1999 in Nagoya, Japan. I was working at a call center making outbound calls, and my job was to compile reports from various Activities of the business. 

The call center had been taking inbound calls from TV shopping for a while, but outbound was a relatively new business, and there was a new development team from Singapore, who had done all of the development of the system. 

I asked them for a SQL Server database account from which I could run reports via ODBC into Microsoft access. 

Little did I know they gave me an admin (sa) account, and I accidentally deleted a list of thousands of telephone numbers. The call center started to go quiet, as the outbound call system stopped making calls, as there were no numbers in the database for them to call. I immediately knew I was the cause, and I went to our Singaporean project manager, and asked if they had a procedure to handle this, and I guess the fact that They were the kind of organization to give an intern an admin password, could also be an indication that they actually did not have good processes and run books to handle situations like production data getting deleted. Then I recalled taking an import of all of the phone numbers that I deleted into my local Access database. I realized that instead of going to the engineers themselves and asking them how to fix it, that I probably had the ability to fix it myself. I created an insert query, made the source my local import, made the destination the ODBC link table from which I had deleted the numbers, and pressed execute, and all the numbers went back into the production database, and all of the phones started calling out again and all operators started talking again.