name='Steve Crook']The nastiest ones that have appeared recently are the ones that say they've charged you for a flight to somewhere-or-other. Then, after they list all the details of the hundreds of dollars they've charged you, they kindly offer a link for you to correct it in case it does happen to be an error.
Of course it's a scam and if you do go to their site you'll be asked for all sorts of personal and financial details - as a security measure.
But they send out a few billion of these things and even if only a handful of people fall for it then they can still clean up
Steve