Watching Paranormal State and calculating the kids' points for the day.
We set up a system whereby they earn 'points' for various chores, taking the dogs out, saying "Ma'am" and "Sir", grades, etc.,; and losing points for infractions such as poor grades, forgetting to say "Ma'am" and "Sir", arguing pointlessly with each other, etc.,.
Each 'point' equals a minute on the computer. The Girl, so far, has accumulated at least 4 hours of computer time while The Boy is at 0. So far, it seems to be working like it should. They each have Excel spreadsheets where their running totals are kept.
We're trying to teach them that being polite and responsible is the best way to get along in the world.
Besides, I told them that if they get the reputations for being nice, polite kids, they can get away with a lot more. It worked for me.