I once invited a parent to sit in class. She was so ashamed of her kids behavior. I don't remember if he was bad while she was there since this was about 10 years ago. I had another student who would talk back, roll her eyes, etc.. Everyday I sent her mom, who was also a teacher in the district, an email everyday with what her kid did and didn't do. She got tired of it and finally pulled her kid out. She also tried to get me to pass her kid who had a ton of missing grades. I told her that depends on the quality of her makeup work.