Cats - they're so independent and fun. My cat for example, she's turning 5 in a few weeks but she acts like she's queen of the world. Really demanding and sassy. She will only sit on your lap if you have the brush to groom her with. If you stop grooming her she goes away. She must be played with when she wants to be played with otherwise she will not leave you alone.
I also love how stupid cats can be sometimes. My cat will catch a mouse, bring it in, and then let it go in front of her and watch it scramble away, then look shocked when she realises it isn't there anymore. Seriously? You let it go, it was hardly going to stay there was it?
I love how nosy they are. My next door neighbours have children so we regularly here them playing outside. If there's any noise, she is straight on the windowsill, ears pricked and tail flicking to see what's going on. She's so funny.
Dogs are cool too, but they're so happy and loyal all the time it's boring. I like it when cats have attitude and do what they want.