I don't think UAC is spoofable - if I remember well it minimizes all the other windows and hides the taskbar, which you shouldn't be able to do with a regular d

I don't think UAC is spoofable - if I remember well it minimizes all the other windows and hides the taskbar, which you shouldn't be able to do with a regular dialog. gksudo is definitely spoofable, except I almost never get a gksudo dialog. I am not trained to expect every other app to periodically ask me for my password.