Just a simple bash alert for sudo command. To do it permanent just copy it along your ".bash_profile" file of your home. Maybe it could save you from a "sudo rm / -R" because you forgot the "." before the slash...

bic_bash_profile.sh

#just a secure sudo
bic_sudo() {

echo -e "\e[0;31mAre you sure\e[00;m that you want to use sudo?";
echo -e "\e[0;34mMaybe you can do it in other way..."
echo -e -n '\e[00m'
read suresudo;

if [ $suresudo == "yes" ] || [ $suresudo == "y" ] ;
then
        sudo $@;
else
        echo -e "Remember:\e[0;32mEvery time you do a bash mistake god kills a kitten"
        echo -e -n '\e[00m'
fi

}
alias sudo='bic_sudo'