Quoting from this site:
However, it turns out that Toxoplasma-ridden rats show no such reaction. In fact, some of the infected rats actually seek out the cat urine-marked areas again and again. The parasite alters the mind (and thus the behavior) of the rat for its own benefit.If the parasite can alter rat behavior, does it have any effect on humans?
The Toxoplasma needs the cat’s digestive system to complete its life cycle, so it makes the rats hang out and wait to be eaten. Freaky…
What’s even freakier, is giving the rats drugs used to treat schizophrenia in humans–makes them act like the other rats. They stay away from the big hungry predator’s house.