So you know how some mushrooms can control brains of ants they attach to?
What if you found out your pet cat or birb was being controlled by one since one week before you adopted them?
Would you go get it removed or is it like the fungal hivemind is your pet now?
Reminds me of an episode of House md. A 17 year old girl finds Dr House really attractive, hits on him really hard and starts stalking him.
spoiler
Turns out she had a parasite in her brain affecting her judgement. House cures her.