A friend of mine has a rather precocious daughter with poor impulse control, and asked if I knew any behavior games that encourage children to think out the consequences of actions before they do them.
I'm familiar with the Good Behavior Game and the like, but standard conditioning hasn't been very effective with this child in the past. She's quite clever about subverting rules when possible, and shutting down entirely when subversion fails.
Please, one suggestion per thread so that the karma thing can do its thing.
If the daughter loves video games then give video game time as a reward for good behavior, and take away video game time for bad behavior.
I'm reminded of http://lesswrong.com/lw/2ay/rationality_quotes_june_2010/2385