Half of Kiss

Doesn't matter really does it - Rockers traditionally get a panning in this competition, but these two here, raise one of the fundamental questions, all people who prefer soul music wonder about rock... 

Why is that every time you try to take a photo of a rocker, they make with their hands like that..? Does it mean something we don't know, or is it just like a daft thing they all do. We always wondered about that...