A Huffington Post article, As Economy Crashed, Banks Made A Killing On Overdraft Fees overviews a couple of reports on the profits financial institutions are making when people screw up and withdraw more money that is in their checking account or go over the credit limit on a card.

The report estimates that about 51 million people were affected - meaning that one in six Americans were hit, on average, with $470 in overdraft fees last year.

Check out these minor facts (from Moeb Services):

The article has the original report embedded in the post.