I was out about a year ago with some friends, and we came across this small little shop that we'd never really bothered to visit, but we went inside. The cashier tried selling us some cool things; a bo-staff, a gargoyle, but we ultimately decided to buy some velvet pouch filled with some white powder. The pouch was sort of red, maybe brown I can't remember too well, and strings to close it had some blueish gems on the ends.
We decided to check what was up with the powder, and I think it has some demonic influence to it. My friend picked some up, coughed, and the powder blew into my other friend's face. He started freaking out, and got really hyper. It would only make sense, as the store was one of those "Oddity Shops" that sells some odd stuff.
After this little incident, my friend kept the bag. He stopped hanging out with us, and whenever we saw him, he always looked really different. Almost like he was in his own little world. It scares me that something so vile and Satanic could actually be so easily obtained.
EDIT:
This wasn't actually the first time I'd run into something like this. Somebody at my local park tried selling me something similar, but it wasn't in such a fancy pouch. He wasn't really "clean" looking, so I didn't trust him.