I type really quickly in a "stream of consciouness" manner. I don't think about sentence construction at all, and make horrendous and basic spelling mistakes/typos a heck of a lot. Also, I often just completely miss typing a key word in a given sentence, but I don't see it until I review it later. Some of my posts here are truly dreadful!
I know I do it, I've done it all my life, but I'm just too dumb and impatient to slow down. Oh, using an iPad makes it MUCH worse!