When she found out that her son was being disruptive on a daily basis, she came to school in a ratty nightgown and robe, hair in rollers, and filthy bunny slippers. She sat by her son in every class, walked him through the halls holding his hand, sat by him in the lunch room, played volleyball with him in PE, and never stopped the very audible toddler-level sweet talking.
She promised to do this every time she got a call from the school.
The kid never gave us a bit of deliberate trouble again. Turned out to be one if my favorite students. To paraphrase Anne Shirley, I like best the ones who COULD be bad, but choose not to be. Most complete turn-around ever.