The Sims 2 Ultimate Sims 2 Guide

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[32] Helpful NPC's 

These NPCs will only appear when you either have a very low social bar or
your aspiration meter is extremely low. This is only because you suck and 
cannot lets your Sims go to heaven without living through hell. These 
imaginary people will come and whisk your Sim to somewhere and fix them up,
no just kidding!

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[32.01] Social Bunny

The Social Bunny is an invisible bunny that only appears to the Sim with the
full red social bar. You can do anything to this bunny, you can kiss it, hug
it, slap it, anything you want with it. The social bunny will leave when your
social bar is back to the halfway mark.

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[32.02] Therapist

The therapist is the only cure to your Sim when he or see has a aspiration
meter that is below double red. This therapist will come from the sky and talk
to your Sim. Eventually, your Sim will go back to the single red bar and you
will be able to control the Sim again.