Flip a coin.
Tails? Relax.
Heads? You've got a parasite in your brain.
[ooc I wasn't planning on posting today, but since you guys seem to like Cal so much, here's a plotless crack post. No, he hasn't gone insane, that's verbatum from p.41 of the book, reffering to Toxoplasma, a real parasite in 50% of humanity ♥]