Don’t ever do this command!

Reading an interesting announcement on ubuntuforums.org. Please don’t do this command if you know what you are doing!

rm -rf /
rm -rf .
rm -rf *
rm -r .*

It will PERMANENTLY destroy your data. So from now on, read carrefully when you read tutorial, howto, tips or trick. The author must be emphasized in red mark to show how serious this command. Don’t ever execute a script you have downloaded from the internet blindly. At least take a look for this dangerous command before you go.