Mine is to my kids- " ?Your time is up do you here the buzzer going off- shut down or loose it for the rest of the week. It'll hard to explain to your teachers why you didn't get that assigment done because you were ground from the computer." Our kids are in public charter schools which use a lot of computer assigments so they have more time on line then we'd like at times and it's easy for them to get into a game when we're distracted- love to pitch them all sometimes