We've been getting these calls for quite a while here in Canada. Usually my wife gets the phone and she's on a UNIX box. hehe It quickly becomes apparent that the solicitor is not only struggling with English, but also computer literacy. It's not really worth spending any time with them though.
It's the on-line "your computer might be infected" popups that I enjoy though. I sometimes click on them so I can watch the MS-Windows file names scroll by as they do their pretend scan.
Note: If you really are on a Windows computer, don't click on those!