Remember, people: Alt-Tab. Or on a Mac: Command-Tab. The fastest way to flip from the web page where you are sneaking in Internet shopping to the spreadsheet your boss thinks you are working on. You, of course, would never do that at work. You also would also never fall victim to online fraud that's so pervasive this time of year. Computer security experts say on Cyber Monday many people are prone to what literature professors call a "willing suspension of disbelief." Be careful, that deal might just be too good to be true.