You know, they could have done something with user agent (up-to-date Safari, Chrome or Firefox gets a YES, IE or older versions get a NO, etc), reverse IP looku

You know, they could have done something with user agent (up-to-date Safari, Chrome or Firefox gets a YES, IE or older versions get a NO, etc), reverse IP lookup (to determine if you're in a "techie" part of the country), etc. That might make it a bit more interesting than randomly picking.