I hope this isn't offensive, but this is a very good talk on
Superstitions by Ajahn Brahmavamso, a monk from the Thai Forest
tradition.
http://www.youtube.com/watch?v=RggiVQ6F0fk
There's a Thai general who paid half a million dollar for a
charm supposed to stop bullets. He tested it, got someone to shoot
him, and amazingly, died. This is folly.
Another thing is this... our life situations has to do with
karma, and no such charms can change it. If we want to get rid of
bad luck, then accumulate good karma.
my fav part of this talk is when Ajahn Chah points to the big
Buddha statue behind and told the visitor that if u use it as a
protection amulet then it sure can guarantee to stop any bullets
:-D