When Claire and Phil cancel Christmas after finding what looks like a cigarette burn in the sofa, Alex suggests she and her siblings all confess so that their parents will reinstate Christmas and go easy on them for protecting their siblings. Unfortunately there is an incentive to cheat, but Luke isn’t smart enough and ends up confessing to something he didn’t do.
See more: cooperation, game theory, incentives, prisoner’s dilemma, sequential moves, simultaneous moves