My 13 year old DDs go from school to the in laws every Wed, have dinner there and DH collects them. They don't particularly like doing this as they are old enough to go home alone, until me and DH get home from work, which we allow on other days. It's just basically to keep in touch with their grandparents, and usually the GPs love it (I think!).
Anyway, yesterday DH arrives at his parents to find his mum in floods of tears, and his dad having stern words with DD2. Apparently she was doodling in a notebook and wrote "Nan smells of fart" 
. Bit childish at 13, but really is it worth the drama that followed, I just don't get it.
DD doesn't want to go there anymore, she can't understand the reaction either and would much rather just go home after school, which I'm tempted to say yes to.