The call

Got a call from my son's school today. They said they needed to talk to me about his behavior.
I said, "lets talk, whats the problem?"
They said, "His letter to Santa was totally unacceptable."
I asked" How?"
They said, "He wrote;
Dear Santa,
This year, instead of toys, games, candy or cloths, can I get a list of all the girls in my class who are naughty?"
Kids!