I've made a few, but then again...
I looked this morning at which of my posts have been most recently read by people, followed the link to the post itself. Almost immediately, I found a typo.
I do, of course, try not to make spelling mistakes in the first place. In fact, my spelling is good - very, very good - so if you see a typo it'll most likely be a slip of my finger, or tapping the keyboard too lightly to register a stroke (happens a lot). I run my potential posts through a spellchecker, of course, (every little helps!) but I often find myself falling into the trap of running the spellchecker, re-reading something, deciding it can be better-worded, re-writing it (complete with typo) and not re-checking. Another favourite is writing a typo such that it spells a perfectly good word, albeit the wrong word. That'll fool a spell-checker every time!
The reason, as you might guess, is stroke-related. Certainly a part of it is that, being one-handed, my one hand has to traverse the entire keyboard. So, especially writing key combinations, Shift + P for example, some agility is required. On the few times I've had to type them, the Euro symbol (on a UK keyboard, it is Ctrl + Shift + 4, I think) is a particular demon.
There's another factor too, though. Occasionally, my brain just says "Fed up working out which key to hit, so just hit the closest one". Of course, I know immediately that is a typo, so can correct it. Mostly. But it makes for slower typing. My foot does the same, not that I try typing with it! I will often end up standing on things, for no other reason than my brain says "Down. Now.". I suppose with my foot, balance comes into it as well. Unless I have two feet firmly on the ground, I am likely to topple. I might do that anyway. I like to think that any falls (i.e. onto the ground) are long behind me but I still need to be careful. I've been down a bit on soft grass, even once quite recently, just when the unevenness has tipped my balance as I put my foot down.
So please, if you see a typo in one of my posts, forgive me. If you let me know, I will correct it. When I spot it anyway, I will correct it. My friends tend to be very forgiving if they encounter one of my mistakes, but for me it is pure embarrassment, because I used to do so well. Bear in mind, too, that I'm not brilliant at spotting things these days, either.