What is the most insulting thing your child has ever said to you?

I think is my boy 10 when he was 8 one day I fetch him back from school in the bus, after that I have lunch with my daughter and there are something left over on my teeth but on the bus he saw it, and he ask me "mummy why have thing on your tooth" oh I know that is yesterday vege!!! Oh my god that so embarrass. On that Moment I am angry and embarrassing. Hahahaha