When I was working as a sysadmin, MySQL was popping up with errors in Nagios. I thought to myself, OK, I'll just restart the MySQL server to see if the errors

When I was working as a sysadmin, MySQL was popping up with errors in Nagios. I thought to myself, OK, I'll just restart the MySQL server to see if the errors go away. Turns out, the client was using MySQL in a non-standard way and they were storing the last day's data in memory. Whoops. I was fired from this position.