I've seen a lot of comments in which people provide their own ending to this sentence. I'm confused by this practice. It gives the comment a slightly more official appearance, as it appears to be similar to the pre-written comments that I see when I flag a question.
Is it considered good practice to write your own "custom" off-topic messages? When other people write them, does it mean that the question has been flagged, or is it just a normal comment?
edit: I think that this related question clarifies that this is an option available to users with sufficient reputation to cast close votes.