Mystery Cat

Well, this has gotten off to a brilliant start hasn't it? I can't think of an url thingy, so i stick to my basic description, 'technologically retarded'. I have lived up to expectations, as I now appear to be called 'Mystery Cat'. Which was actually meant to be the topic of my blog. Just great.
Either way, although any suggestions as to how I work this thing properly would me much appreciated, I suppose I'll carry on, and warn the world about Mystery Cat.
During the bleak mid-winter, when snow had finally fallen in time for Christmas, I began to notice little cat paw prints in the snow. This is not unusual. Cats seem to like having days out in my garden for some reason. I admit I was disappointed, when the snow got extremely deep, that I did not happen across a deep cavern-like trail across the grass of which a cat had tried to trudge through the foot deep snow. No, no such luck was my own.
We never saw the cat that made those footprints, and the cats stopped staking out the garden once it hit november, so there was much suspicion.
So, why have I dedicated a blog to this? Because as I sat staring enthusiastically at the computer screen in absolute boredom, I heard a screechy noise, that I firstly assumed to be my sisters messin about in the next room. Then I realised only one of my sisters are home tonight, and she is currently watching t.v with my mother and father (I'm not anti-social, it's jsut I get a bit bored of 'Deadliest Catch' sometimes.) and thus, my theory was defied.
The screeching continued. Sounded like a cat. An angry cat. A cat that is now known as Mystery Cat. And for good reason.
My curiousity got the better of me, so I went to investigate. I looked out the back door to the step, and though I could here the cat, I could not see it. I turned the outside light on, and still, nothing.
My little sister appeared in beside me, questioning why I was glaring out the kitchen window, especially as it was pitch black. I must say, I shushed her and told her to listen carefully in the upmost conspicuous and investigative manner, which I'm rather proud of :)
But that is beside the point.
In contrary to Niall's first explanation of the cat noise via msn, I am not mad. My sister also heard the angry cat. Unfortunately, his second explanation is yet to be proven wrong, I could well have infected Olivia with my madness. But hopefully not.
Anyhoo, I have concluded that it is an invisible cat, as it is the only other reasonable explanation.
Mystery Cat, I'm on to you.