Obviously IABU. But DS has got bloody nits again after just FOUR days of being back at school. It has to be one of his friends as they all sit together on the same table for most of the day, plus play together at break/lunch.
I have mentioned it to the mums I know (in a "I'm completely exasperated" kind of way) as we all got an email about it and I just get crap responses saying 'DC never gets nits, poor you". Well someone else has them! 
Anyway, he has a party this weekend and I want to sit there and go through all their hair to see who's got them. I'll at least be watching to see who's scratching as I'm beyond fed up. 