When you record all of season 10 on Sky + and then won't delete it till the season comes out on dvd just so you have all 10 seasons to watch.
My parents and I are hooked on it and if we should happen to be on the phone on a tuesday night close to 9 we have to hang up about 8:55 so we can get drinks made. (I live 150 miles away from parents)
An ideal family evening is spent watching CSI with either cups of tea and biscuits or alcohol.
When my parents went to Vegas, they asked me house sit and I agreed to do it as long as they bought my back souvenirs. I got a CSI iron on badge and a CSI sweater plus a CSI keyring amongst other items.