I am annoyed at myself - the argument with Joey last night could have been avoided by me.  I took the position that a deal was a deal and 15 minutes was 15 minutes.  What I should have done was look at how much was left of what he was watching and been sensible.  If there was a lot, I could have said, OK, you can't watch it all but I'll give you 2 minutes more or whatever.  If there was going to be a slight over-run, I should have allowed it so that he could have finished what he was doing.  It IS important that Joey understand that a deal is a deal but getting into a fight over a minute or two of YouTube is silly and counter-productive.  Did I mentioned that I really, really hate bloody video games such as Mine Craft (it was what he was watching last night and it is scarily addictive for him).