Devils horns...
Hey Alex!
I was very aware of this at the concert too however I found it hard to determine half the time if what I was seeing were 'Devil' gestures, or simply the 'Hard Rock' gesture...
...they are identical except for the direction your hand is facing... and having lived through a naaasssty mosh experience during NIGHTWISH, everyone was being mixed up like a frothy cocktail and hands and fists were spilling out in all directions!
Its in Rock culture nowdays to use these gestures (either of them) without having much of a belief in whether they MEAN anything or not (like you said, many don't realise)...
For the record, it didn't bother me either way. The 'Devils Horns' gesture I see as USELESS in terms of black magic without the power and determination to make it MEAN anything more than a hand gesture. You with me?
Interesting topic for discussion mate! I wonder what others think...
Dimi