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I have always been a dog lover, and always wanted a dog. I always considered cats to be evil and manipulative and trouble makers. They are all those things.
But they are also fun to live with. My last cat was 10+ when I got him. These two are 18 months and I am learning the hard way that the fact that they are litter mates means nothing. They are playing, I think, but they hiss and spit and growl at each other. They run up and down the stairs like a herd of elephants.
They are strange - but they have us well trained.
Good that Sam chased out the intruder, if he hadn't there might have been an ongoing problem. He will be toddling around with his new found confident swagger for days.