Tieflings
Tiefling is a word which essentially translates to "devilish one". Tieflings are the demonic descendants which result when a sexual union between a demonic creature and a humanoid produces half-demon children, which in turn infuses those half-demons' descendants with demonic blood. In the Dungeons&Dragons game, tieflings are one of the possible races to which you can have your character belong. I found this hilarious interview with a tiefling and a gnome (though you might have to be geeky enough to be familiar with certain trivia regarding Dungeons&Dragons to fully appreciate it).