Bank One
So now that Chase owns Bank One, check out this interesting overdraft policy. Lets say as a matter of academic interest you have $100 in your account:

balance: $100.00

Lets say you make 10 purchases with your debit card that day. The first 9 purchases are for $1.00 items:

debit: -$1.00 x 9 = $9.00
balance: $91.00

The last purchase is for $101.00.

debit: -$101.00
balance: -$10.00

Now that last purchase puts you in the red for $1.00, triggering an overdraft fee of $30.00. That's not too exceptional. That's to be expected and I don't have a problem with that. That's part of the contract.

But the policy of the bank NOW, is to sort all purchases in descending order by value when calculating the transactions for the day. So the $101 gets processed first. Descending value vs time of purchase. So the overdraft fees in this case start with the last transaction of the day and cascade down to the tiny items that were bought first.

Then the next day you get a:

$300.00 insufficient funds fee

For going in the red by $10.00 goddamned dollars!

Of course it doesn't specify how the hell they calculated that amount -- you have to call them. Then they explain the policy and then you point out how lame it is and then they agree with you and put you on hold and you have to really push to get a manager and finally you get the $300 in charges reversed.

And then you go a less evil bank and open a new account.