When I teach handwriting, I play "Good Letter A, Bad Letter A". (Using "A" as an example) I write examples one by one of the letter A. Some of the examples are written incorrectly or sloppily, and some examples are correct and neat. The kids watch the letter (and watch how I write it, because I like to trick them!) and if it's a "Good" A, they give me a thumbs up. If it's a "Bad" A, they give me a thumbs down and offer reasons why the letter is bad. The good/bad letters are accompanied by a smiley/frown face above, and the bad examples are crossed out or erased. It's a success in my room!