Replying to Suggestions to get back at someone, ns i need your evil thinking

so basically this kid was in my car a month ago and wanted to have a smoke . i told him sure just open you window . now its a 2 door coupe so the rear windows open outwards. he pushed and it fell out.

now i told him to pay me back. next thing i know. HIS FUCKING DAD calls me and i start to deal with him . for 1 month i try to contact the little twit but he hides from me (he is truly scared of me) and when i come around to fix the window. i send the bill to his house. once again i get a call from daddy . I had to discuss with his dad for like 45 minutes to finally agree that he pays me half (he said hed pay all of it at first). now im pissed beyond beleive at the kid . so this is where you guys come in

give me ideas on how to get back at him. problem is :he cannot know i am involved

he works at mcdonalds if that can give you ideas.

ohh yeah one last thing while i was at his house i talked to his older sister who is smoking and managed to get her number in front of her dad (his dad took my side of the story and loved me ) so fucking his sister is definetly a possibility. but i need other ideas

you evil masterminds must have crazy idea. shoot em


hes 16 and im 18