On their vests?
It's inordinately trivial I know, but it is so sloppy and smacks of not caring.
It's happened a few times to ds, and to be fair he is very wriggly, so I've been sympathetic, but now dd comes home with them undone and she is perfectly co-operative so there's no excuse.
Thank God they are only there till the end of next week and then we'll be out of Kids Unlimited for good.