Ha, as you can certainly see by this example, I don't use spell-checker when posting. Normally I use iPad for IH, which does have "auto-complete" but certainly it doesn't work if the very first letter is incorrect!
I rarely use auto-complete, but I've had some pretty funny results when I have. I usually will edit a post after I've posted it, because the print is too small in the editing box IH provides.
I've been able to spell "antidisestablishmentarianism" since I was 9 though. My Father used to bring home a new word everyday, and we'd discuss it around the dinner table, well mostly just him and myself =)