You want a decent R with your teen. You're trying to back off and let them have some space and do their own thing whether you approve of all of it or not. You give them a credit card and tell them they are allowed to use it for gas purchases only. You get the statement and find that there are other things charged than just gas. You confront them and they tell you that it was a one time thing. You're not in the mood for excuses, you tell them that if it happens again they lose the credit card.
“People are just as happy as they make up their minds to be.” Abraham Lincoln