Social Bunny

The Social Bunny is an NPC in The Sims 2 that visits Sims when their social need is too low. Like the Therapist, only the lonely Sim can see it.

Raising the social need
Just having the Social Bunny around raises the social need, but the lonely Sim can interact with him anyway to raise it, ranging from friendly kisses to outright fighting. The Social Bunny leaves when the bar is back up to the halfway point.

Multiple Bunnies
If multiple Sims are in social failure, the other bunnies will be seen when a lonely Sim is active. However, they will be invisible, and cannot be interacted with.

The bunnies may interact with each other, though. Social Bunnies come in three colors which are blue, yellow, and pink. Generally, Social Bunnies of a different color will be friendly with each other, with blue and pink ones going romantic. However, much different sparks fly when two bunnies of the same color meet, as they'll actually fight with each other.

Friend bug
There has also been a bug where the social bunny can actually become a friend. (eg. He comes to parties, goes on vacation, visit, and possibly all the other things that normal friends can do). If social bunny is on the lot when a Sim dies, it could say, "[Sim Name's] friend, social bunny, got §§§."

The Social Bunny vs The Tragic Clown
When The Sims series started, the social bunny was not the first NPC to show up to depressed Sim's houses to cheer them up, it was done by the Tragic Clown in the first game. The tragic clown came whenever a Sim's mood was half-way low and if there was a painting of him hanging around somewhere. However, the Social Bunny came when the Social need was empty only. One key difference between the two is their success in trying to make depressed Sims feel better: The Tragic Clown always made matters worse while the Social Bunny managed to bring the low social up to 50% high.

Trivia

 * The fact the Social Bunny is only seen by the active Sim is a reference to the films Harvey and Donnie Darko in which the main characters can see a 6 foot tall rabbit who is invisible to everyone else.
 * In The Sims 3 the social bunny does not appear when a Sims has a low social need, instead he only appears in a cameo in a poster under decor. The description of the poster follows: "He strives for social acceptance, but his moves are so awkward he is doomed to eternal failure. In this way he "represents the inner struggle for acceptance in all of us." -Quote by Charles De Londres
 * "Social Bunnies United" is the name of a charity Good Sims can donate to.
 * Social bunny can be seen on the Kidztube and KidZ Zone stations on the television.
 * A pink social bunny costume is unlockable in MySims Agents.
 * There is an Easter Bunny mod with a Social Bunny used in it, but he doesn't talk to sims, he just leaves eggs that sims can eat.
 * Sims can also paint a painting of the Social Bunny.
 * If you type in "boolprop testingCheatsEnabled true" (without " ") and enter CAS and then press shift and N into the first name box, it turns on debug mode. In debug mode, you can have (for adults) social bunny outfits of any colour and a hairstyle that gives the head of the social bunny. This only gives the appearance of the social bunny, however, and does not affect behaviour in any way.
 * Toddlers and Children Sims cannot get a Social Bunny. If their Social bar gets very low, a warning will pop up in the top-right of the game screen saying that they need to be talked to. If they don't get the Social need increased eventually, the Social Worker will come and take your children away.
 * The Social Bunny can also make a Sim's comfort hit rock bottom.
 * He appears on bags of apples in stores

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