In this day and age when most of us are glued to our computers and electronic devices, error messages are scary. If my internet goes down or some vital program stops functioning I panic a little. Therefore, these sticky notes that look just like those frightening pop up windows would stop me in my tracks.
I’d get used to them eventually but at first, they’d get all of my attention. You can get a stack of notes that includes both Warning and Error messages. Just remember they won’t be as effective on Mac users.