Yep... They are Ocult tools, and yes things have been reported to go wrong... I have had many a worring thing happen after using them, not sure if it's co-insidence or what... I mess with it cuz I can, I am an adult, I have stated if you scare easy don't play with it...
I would suggest know one plays with these things, unless you don't mind your house seeming to be haunted... Bouts of depression and Messed up dreams...LOL
My opinion, it's worth it... I like to know rather than guess... Rather regret some thing I have done, rather than some thing haven't.