Most Vodou magic is proprietary, by which I mean that the magician
will do the work for you, but she or he will not tell you how to do
it yourself, you have to pay the magician.

But here is one that most people in Haiti know. You will need:

A knife, fork and spoon
A yard or two of bare copper wire
A white candle
An image of Erzulie Dantor (available in Hispanic botanicas as either
the "Mater Salvatoris" or "Santa Barbara Africana", a black woman in
a blue robe and wearing a crown, against a gold background, carrying
a brown child in a pink robe who also wears a crown).

Okay! Now this magic is usually done by women against men who have
offended them or by men who know they have done something wrong to a
woman and want to ward off her aggressive magic.

Put the knife and fork together vertically. Put the fork across them
horizontally to make a cross. Wrap the copper wire around and around
at the midpoint, to hold it all together, and while you are wrapping,
say what's bothering you!