Don't worry! It's only stuff...

# stop mysql
/etc/init.d/mysql stop
mysqld_safe --skip-grant-tables &
 
# login
mysql -u root
 
# in mysql
use mysql;
update user set password=PASSWORD("NEW_PASS") where User='root';
flush privileges;
quit
 
# restart mysql
/etc/init.d/mysql stop
/etc/init.d/mysql start
 
# Links
http://www.cyberciti.biz/tips/recover-mysql-root-password.html
http://www.cyberciti.biz/faq/mysql-change-root-password/