It's a pretty shaky question when you come home from somewhere and your parents tell you that they have found something in your room. Probably everyone's first answer is "I swear it's not mine, Uncle Joe gave it to me so that I can keep it safe for him." This I think is not a very clever answer at a time when you are not even sure if they are talking about your weed stash.
In contrast to this situation, some are quite lucky to have parents who are a bit different. The picture you see is an example of one of these kinds of parents. A girl comes home from school and she finds this note on her bed.