internal spell checker?

I've been typing for what seems like FOREVER - I don't mean right now, I just mean in general. I feel like I have been using computers and typewriters for longer than I haven't. Anway I was typing up something the other day when I noticed that I always make the same spelling mistakes...I mean EVERY TIME with some words. Thats not the weird bit. The weird bit is I have deleted it and corrected it as soon as the last letter is typed, like my very own spellchecker. So far I have noticed the following words are consistently typed incorrectly:

An - 90% of the time I write AND instead..especially in comments....
Thier - instead of their
Update: HIME instead of HIM - i've just caught myself doing it three times in about the same number of minutes!

You know what? I can't for the life of me think what the other bloody ones are! I'll be typing something tomorrow and remember or come across one of the words, whats the bet? I'll keep a notepad by the laptop and write it down when I do it....cos I know I will at some stage.

The thing that gets me is, I KNOW how to spell these words, like I said, i'm deleting and correcting before I even hit the space bar ready for the next word. And when writing as opposed to typing, I don't write them wrong. So can someone explain to me WHY it's only when typing? Why certain words too? Is it some mysterious look deep into my psyche? Or is it just my finger muscles messing with me? Is it an internal spell checker that just needs to justify it existence? I dont think it's this last one because if it was I would like to think my brain is smart enough to pick different words all the time to avoid detection....ok this is starting to get weird, so i'm stopping. RIght now. No more theories.

Start taking notice of how you type, do any of you have similar experiences? Or am I just a freak???! Ok, don't answer that last question..nighty night peoples.

P.S Yes i've been a little absent the last couple of days. Yesterday was Zoe day....and today was cleaning day. Oh and RAFFLE TICKET DAY - spent 3 hours doing raffle tickets for the school easter raffle....oh the joys of BABE volunteering HIS time....which of course ends up being mostly mine!

Tags: typing, errors, freak, spilling the beans