By brute-forcing it using GPUs. With a consumer-quality graphics card, anyone can try thousands of variations on every word in the dictionary in a few seconds.

By brute-forcing it using GPUs. With a consumer-quality graphics card, anyone can try thousands of variations on every word in the dictionary in a few seconds. Common passwords that are not related to dictionary words (such as numbers and dates) take an ignorable amount of time longer. While you may use better passwords than this, it's certain that some of your users do not.