As an idiot teenager, my girlfriend and I thought it would be "fun" to try out a Ouiji board. The damn thing worked and we started a conversation with something. It said some evil shit, and once we both realized it wasn't the other one playing a prank, we immediately stopped doing it, and eventually tossed it in a fire. Eastern philosophers have written more logically on the topic of spirits/demons/whatever. It basically comes down to the theory that demons can only act on the world through the willing or weak minded. So basically any ritual xan work, as long as the person believes it'll work and willingly open themselves up to spiritual entities. It can be a seance, desecrating bodies, or a putting on a demonic concert on TV in front of millions of people.