At six years of age I could recite the powers of 2 up to 65,536, having worked them out in my head when I was bored. (Although I've got up to 68,719,476,736 recently)
I would also not go near yogurt and tissues for a while.
But the very FIRST thing was when I was a baby. I used to sit and stare at my father's laptop (when he was using it) for literally hours on end. My eyes were actually fixated on the screen. Now I am a bit of a computer nerd.
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I am a partially verbal classic autistic. I am a pharmacology student with full time support.