You was 23 year old and was a babysitter and have to babysit this kid that are 18 year old.

The parents told you that this kid need to learn something that makes him listen and follow every rules. Sound like he was a big problem.

They told you that he haven't eat anything and was playing games in his room and they leave you both alone in the house. You go to his room and heard

"F*cking asshole!! Take that, b!tch haha!!" and he laughs not knowing you was behind him.