AmSouth Bank / Excessive checking account overdraft fees
I overdrew my account nine cents, and was charged the standard $30 overdraft fee without any notice whatsoever (until I got my statement three weeks later). The $30 fee then caused a subsequent purchase to bounce, resulting in another $30 fee, which then caused my next purchase at a gas pump to exceed my limit, resulting in another $30 fee.
Pretty soon I got my bill showing $1100 in overdraft fees for causing the bank to have to pay out about $150 in charges that exceeded my limit, none of which would have exceeded the limit but for their $30 fee. (Obviously I keep a low balance in my account.)
After I spent three days appealing, the bank credited me $150, I had to pay them $950, I closed my account, and they turned me over to the credit bureau claiming I still owed them the $150 they had promised to credit.
As a percentage, their usurious "fee" is higher than what is charged by the payday loan companies and the corner "mob" loansharks. And it's legal since they bribe state legislators via their "lobbyists".