Voodoo doll

The voodoo doll appears in The Sims: Livin' Large, as a reward for visiting a hidden lot in The Sims 2: Bon Voyage and soon as Premium Content in The Sims 3 Store.

Livin' Large
The doll is buyable and can be used to torture Sims. When used on a Sim, the Sim's comfort and fun motive will drastically decrease. The doll cannot be used autonomously.

Bon Voyage
The doll can be used to perform various activities, from useful things such as making friends or falling in love with another sim, or more minor things such as making a Sim hotter or colder. The doll may fail and backfire on the user if used too often, and can be sold in Sim-owned stores, if frequent visits are made to the Witch Doctor for new supplies.

If a Sim wants the doll, they can acquire one from the witch doctor after repairing all of his broken appliances. As with other repairs, success depends on the Sim's mechanical skill. The witch doctor will lie in his hammock after being greeted, forever lying there until all of the appliances are repaired. Upon successful completion, he will give the Sim the doll as a gift. However, he will cancel the interaction if the Sim is still busy and won't accept the doll. This can be inconvenient for a Sim trying to get the doll, as he'll only offer it once per visit.

Five voodoo dolls may be collected on the souvenir shelf. If that is done, nearby Sims will be cursed into imagining they are being attacked by a bee swarm.

The Effects
The voodoo doll could cause chaos or bring happiness. A voodoo doll can do these things:

Warm up: If Seasons is installed, the victim's temperature will increase.

Cool down: If Seasons is installed, the victim's temperature will decrease.

Romance: Makes the victim fall in love with the user, and automatically queues up the "Make Out" action.

Friendship: Makes the victim become friends with the user.

Saturate: Drastically reduced the victim's bladder motive.

Stinkify: Drastically reduce the victim's hygiene motive

Shake Up: Reduces the victim's comfort motive, and may cause the victim to throw up.

Agitate: Drastically reduce victim's comfort motive.

The Sims 3
The Voodoo Doll will return to The Sims 3 via The Sims 3 Store in January 2012. After a community poll on thesims3.com, it's new name will be named Malleable Mimic.

Trivia
Poupée vaudou
 * the Witch Doctor is immune from the voodoo. The doll will always fail and backfire on the user if used against him and he will laugh at you after that.