I was a kind of quirky kid when I was younger... I sort of memorized the Hobbit without really intending to, along with every other book I ever read. Being something of a quirky kid it took me until about middle school before realizing a) this sort of thing is not normal and b) sometimes its better to keep it under your cap. (I can't do it word-for-word anymore, although I still have fairly good retention. I just stopped doing it and it stopped happening. Happy/sad about that, mostly happy. Being "scary" makes for an uncomfortable middle school experience, and being unable to forget the uncomfortable bits sucks royally. Trust me -- been there, done that.)

One of my friends from high school, also diagnosed as being LD, still remembers my drivers license number. He saw it when I showed him my photo after passing the exam, more than a decade ago. Oddly enough, I have never had a particularly good memory for numbers, even back in my freakish days. (It also took me until about age 10 to figure out the difference between left and right. My little brother, who was exasperated at that and thought I was playing, mentioned that left is always the same side as the mole I have on my left wrist. I still check my wrist to this day, out of semi-conscious habit.)

Ahh, the human brain -- it is pretty freaking weird.