Ah, these mistakes.
I've seen the chat move too quickly for my eyes- A few times, I'll be directing my attention to one person, while I end up calling them someone else in the chat's name. I ended up saying "goodbye" to the wrong person. xD I'm getting better at it though.
Sometimes I'll get all of these ideas in my head, and I can't stop typing. So I'll post a sentence or two, and everyone think's I'm done speaking at the moment, but then I'll pipe back up. A friend has mentioned this to me before, so I've been more cautious lately. I'm not usually one for constant, non-stop chatting, which doesn't really make much sense as to why exactly I do this.