‘Sorcerer’ who believed his tattoos made him invincible arrested in Thailand | The Raw Story
These guys failed to understand the instructions that come with the tat's. These supernatural protections come with a book of rules. Break the rules and you blow the deal.
I'm not an expert, but one rule I know for bullet-proof amulets is that if you ever defecate and urinate simultaneously the amulet is rendered useless. It must show a lack of respect for the gods or something. I don't own any special amulets, but I'm careful not to perform these actions together in any case. If some supernatural entity finds it offensive, well, it's just not a good idea to take chances with the supernatural.
So who knows? Maybe these things would have worked fine if people had only followed the rules.