One of the things many of us love about cats is that they know how to keep us on our toes. Every time we rub their belly, it's a fifty fifty chance whether they start purring, or attack our hand. We never know when they might decide to sick up on the carpet, and if they're allowed outdoors, there are all manner of critters (dead or alive) that they can bring us back as presents.
Just like in real life, memes that use our feline friends can also be unpredictable. People use them to represent all kinds of different predicaments, whether they are actually cat-related or not. It makes kitty-related memes have an amazing versatility, and they provide us with plenty of cute and funny material to keep the ball rolling. The internet will never stop running on cats, so long as all these things stick around in the future.