Belief in The Devil in 2015

[Lucanus]

Hilariously, but not surprisingly, prof mentions musical artists throwing up the horns without actually researching that action's actual origins.  Here, I'll help: http://en.wikipedia.org/wiki/Sign_of_the_horns

For those that don't want to read, its origins are Indian and Italian, and in both cultures were used as a way to ward off evil spirits, not invoke them.  That's also where Ronnie James Dio learned to do it.  He had an Italian grandmother.  From there, it spread like wildfire in pop culture.  But, let's not get facts in the way of a good conspiracy ramble.

^ Beat me to it. You know, there is a village in my province, called Colobraro, which is said to bring very bad luck. I'll spare you the whole story, but in many of the other villages surrounding it, there are little sculptures of hands making the horns gesture on the window sills facing Colobraro. People also do that when turning in its direction.

Doing the horn gesture to someone can also mean that their partner cheats on them, though, so be careful about the context