Cats are born to be master thieves, raised to be super sneaky, and taught the fine art of stalking, hiding and stealing by their feline elders, with some students showing more promise than others.
But even the most inept cats are pretty good at snatching stuff without their humans noticing, that is, when they're not acting all IDGAF about the rules of the house.
And if cats had any concept of monetary value they could make a fortune pilfering jewelry from our dressers and selling our electronics on Craigslist while we're at work. Instead they just steal silly stuff like books and pens then give us that "what?" face.
You can't blame cats for going a bit stir crazy when they're locked in the house all day, so we smile and laugh when they relieve their boredom by stealing stuff.
However, stealing food is a serious no-no when they're in our homes, but if you hang a bunch of delicious fish outside where your outdoor cat can reach them then all bets are off!