After having a little think I reckon a good thing to do would be to make your own VooDoo Doll and utilise it in a routine... not making it rise up etc as ive never thought that was that spooky, but making it effect your specs
With some thought you could make it look like whatever you do to the doll happens to them (first you obviously have to take something personal to them and put it on the doll)
I have a few ideas of how to accomplish some of the things, but im sure there is a lot that's possible
You could put the dolls hand over a naked flame and have the spec feel the burn, tie it's arms and have there arms lock, cover it's eyes and have there eyes lock, cover the dolls face and have there pulse disappear, put a needle in it and have blood appear on them in that area etc etc
Now you'd need to pick the right people to perform this on as it could be very scary to some, but think of how powerful this could be... not on kids though lol
Ok maybe making them seemingly bleed is going too far but you get the picture
Or for some really basic voodoo effect, I have one where you borrow there ring, place it in your hand, put a flame under and they feel the heat