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JKR comments on SotW: Check Consequentialism - Less Wrong
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In a group, with a leader who knows the exercise:
Get a volunteer to act as a judge (or a few to act as a jury, in a large group). Have her leave the room. The leader presents the rest with a short set of Contrived Hypothetical Situations, each with finite options and either clearly-defined outcomes for each option, or a probabilistic distribution of outcomes for each option. The leader says, "Please write down your choice for each problem, sign your paper, and turn it in to me. Then I'll call in the judge, and have her decide on each problem. You get a point wherever her decision agrees with yours. The winner is the one with the most points." When the judge is called in, however, the leader doesn't tell them the actual problems. Rather, the leader just reports the outcomes (or distributions), and asks them to choose which outcome or distribution is best. The winners are announced based on that.
Example: One of the situations given is some variant of the trolley problem. When the judge comes in, she is just asked whether she'd prefer one person to get hit by a trolley, or five. Everybody laughs as she replies "...one?"
Example: The problem given to the group is "You drive 45 minutes away from home to go to a new restaurant for dinner. When you get there, you discover that you dislike the ambience and the selection is poor. You remember that you have decent leftovers at home. You're mildly hungry. Do you try the restaurant anyway (25-minute wait, 10% very enjoyable meal, 10% decent meal, 80% unenjoyable meal) or just head back home (5-minute-prep once you get home, 100% chance decent meal)?" The problem given to the judge is "You're mildly hungry. In 25 minutes, you can have a meal that is (10% very enjoyable, 10% decent, 80% unenjoyable). Or, in 50 minutes, you can have a guaranteed decent meal."
I think this is a fantastic idea, with a patch that is much easier than those suggested by the other responses. Simply tell everyone that for the purposes of this exercise, only that information directly presented in the example is to be considered. People sometimes overlook relevant information or clever third options, and these situations are to be judged only based on the data being considered by the hypothetical person in the given scenario.
If there is any concern about this set up encouraging people to think about things with an insufficient amount of thoroughness, you can save some time at the end for a just-for-fun period where everyone gets to offer their clever workarounds and extra information that would have changed what the proper decision was, had it been considered.