Here's a good story for you:
My Sister had a Florida Sun Pass about 12 years ago now. One day she found some significant bad charges on her credit card. Items like TV sets at WalMart, and some other stuff. I think the total bad charges came to about $5000.00!
She found that particularly strange because there she only kept a small amount of money in that account, just enough to pay for tolls etc.
Anyway they eventually tracked the charges back to the Sun Pass workers that were selling the card info on the web.
Oh, and the excess charges? That was because she had the small credit card "LINKED" to her savings account to prevent overdraft fees!
True story!