Nessie
Go onto the place where you can see the neighboorhood (all of it) and hold shift and ctrl and then press c while you are holding shift and ctrl and a box in the top left hand corner will come up and type in it "nessie" and the lock ness monster will come out of the lake.
More tricks, tips and cheats for this game are right here - The Sims: Unleashed cheats
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