It's good to use secure passwords for your banking accounts.
Art's phone bill is due and due to being ill he won't be able to pay it in person.
Art wants to set up an online banking account, so he can pay his phone bill.
Art follows the instructions and creates a very complicated password and then proceeds to pay his bill.
Art creates an account online and sets up a weak password, so he can quickly make the payment.
His bill is paid on time and now he can pay other bills online as well.
A week later his account is compromised and all of his funds are stolen.