There's a parasite in cat poop that can literally control rats' minds, should they eat it.
It's called Toxoplasma gondii, and it changes a rat's brain function to make them drawn to the smell of cat urine, making it easier for cats to find and catch the rat — literally leading the rat to its death.

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Creepy Facts
RandomIf you're feeling brave enough, this book of creepy facts makes for some interesting read.