What?

Here's the story. I installed Single Player Commands and Toomanyitems about 2 weeks ago, which is around when this happened. I set my time at night to randomly kill monsters. (I had damage off). And I built a little house, spawned an Ozelot, and tamed it. (I LOVE cats).I got a bed and everything. I slept and woke up the next morning to find my kitty sitting down. Every time I clicked him to get back up, he wouldn't. Then after alot of tries, I randomly spawned in the Void and died. In frustration, I deleted my world and made a new one, this time in Super Flat mode. I spawned in a NPC Village. What REALLY scared the crap out of me is that the Villagers had the default skin, although the Villager Children were normal. I thought this just COULDN'T of been coincidental. I did'nt even TOUCH the sprite or PNG folder with the skins of certain mobs. I found a house in the village made COMPLETLY out of Netherrack and Diamond Blocks. Nothing else. And I didn't build it. Does anyone know what might've happened? -XxTryrasumaexX