Biggest command-line mistake? [closed]

In SQL server, on a production system:

update customer set password = '' <enter>

The most recent backup was like a week old.

To mitigate this, I now usually write a select statement first to make sure I've got the where clause correct, then go back and edit it to insert the set clause and change the statement to update.

Biggest mistake? Thinking I had set two variables when I had not. So rm -rf $VARIABLE/$VARIABLE2 became rm -rf /. FreeBSD has recently updated their rm tool so that rm -rf / is not possible anymore precisely because of this mistake!

shutdown -h now 

meant for the local workstation, but typed it while logged via ssh on production server. Since then I always have hostname in my $PS1.

Omitting the -r from a shutdown command. On a remote server. On the other side of the country. With no IT staff in the remote office.

We've all done it, it's almost like a rite of passage at this stage.