If I was evil and went to visit someone’s home for the first time and I know they have a cat, I would rub my wrists with catnip before leaving the house, so when I get there the cat smells the catnip and is all over me purring and rubbing on my hands and the owner is like “omg my kitty loves you! That’s never happened with a stranger before!” and immediately trust me because they have no idea that I jammed their cat’s evil detector on purpose.