Ah, toxoplasmosis! Amazing.
http://jezebel.com/5883939/has-your-cat-infected-you-with-a-mind+controlling-parasite-probably
http://jezebel.com/5883939/has-your-cat-infected-you-with-a-mind+controlling-parasite-probably
So what exactly is Toxo? It's a parasite which is found in cat poop, and you might know it best because it causes toxoplasmosis. It's what pregnant women aren't supposed to catch, and the reason they're excused from cleaning the litter box. If they do catch it, it can transmit to the baby and result in brain damage and death. It can also infect those with compromised immune systems and cause dementia, but healthy people usually just get a quick flu-like bout with it, and then the Toxo is thought to go dormant and rest in your brain. Except it might not be dormant after all.