My gripe is with people who find stuff in their child’s school bag which clearly isn’t theirs and they don’t return it to school the next day!! I’m talking small children here who have a tendency to tea leaf what they like, not in a malicious way but just because they like something. Its the parents responsibility to return what they find. How can they not know that a batman water bottle is not theirs or a pair of swimming trunks?? Return it!!