Correction: You need to get Ani's "Dexter Bear" mod from Modthesims.info
Read her FAQ on the mod, so you understand what it does and get the correct patch level for your game.
You need to install it by putting it into your Documents/Electronic Arts/The Sims 3/Mods folder. (Unzip it, yes.)
The bear will show up under "Hobbies". You buy the teddy bear click on it and it will say select a sim to stab.
Chat with our AI personalities
It is IMPOSSIBLE on sims 2 but on sims 3 you can go to someone Else's house. Hope that helps!
if you want someone else to live at your sims house in sims 3, go to edit town, and then choose the household and click on the other household you want them to merge with.
with a pencil
I'm going to take a stab and say you need to dig for it.
Lots are out. The sims 3 university, sims 3 nightlife, sims 3 adventures, sims 3 generations... you name it!