Looking for a password? Don't use any of these 306 million

When I was taking a computer attack class, the instructor (who worked in one of the security areas of DISA) had a hard drive that had hash and rainbow tables for all passwords between 6 and 20 characters including all combinations with special characters, numbers, etc. He could customize the brute force if he needed to but if he had a compromised password file, he could crack them all pretty easily.