Cats are super sneaky. Their ability to walk quietly around the house and sneak up on people is uncanny.
If you own a cat, you know the sheer shock of turning around and seeing your pet staring you in the face, as though they've been there the whole time.
Honestly, cats would make the best spies. They don't take any crap from anyone, they're not threatened by authority, and they're sneaky smooth.
Here's a list of cats who have already applied for the CIA, but will most likely get rejected. Pro-tip: it helps if the other person can't see you!