a lot. >> aaron humbert: might as well went to vegas and put it all on red. >> joline humbert: ( laughs we would have had a lot more fun. >> safer: at least in vegas, you know the odds always favor the house. elsewhere, even the most sophisticated among us can be had. for instance-- our gullibility expert, stephen greenspan, who, after writing a book on the subject, discovered he'd lost $400,000 of his retirement money to, who else? bernie madoff. was it embarrassing for you? >> greenspan: two days after i had the first book copy in my hand, i found that out. well, it was painful, obviously. >> safer: and the fact was, greenspan had never even heard of madoff. the hedge fund managing his retirement money had simply reinvested the $400,000 with madoff. >> greenspan: i don't even think i read the prospectus. i trusted the people i was turning my money over to, and i've always done that, and it's usually worked well, except in this one case. >> safer: what did your wife say to you when you confessed that you lost part of your nest egg? >> greenspan: "i told you so." because i had tried to