I don't want to go into details of what he did as it might out me but basically it was very naughty - school have dealt with it in terms of missed playtimes for the rest of the week.
I am not sure what I should be doing at home - me and DH have spoken to him about what he did was wrong, how disappointed we are in him and told him he can't watch any football Thurs and Fri night (he has been watching the first half of every match since the Euros started). We have also told him he will not be playing on the laptop or Wii for 2 days. Is this enough?
Background is that he is not often deliberately this naughty so it is a bit out of the blue - he does the general low-level boy stuff and every so often (maybe once a year) will do something really naughty.
Also, he is not quite 6 yet but will be very shortly.