I almost normally check my post before I click reply so I'll see if I have a / some typo(s). Normally I will make a typo on a long word or something like that. Sometimes I also hit ; instead of ' so I end up with 'don;t' & the like. The most common thing that happens to me is that the caps lock gets turned on accidentally & I will keep on typing the sentence unaware of the caps lock is on.