I’ve played this game many times with great success.
Give each member a few sweets (in wrappers e.g. smoothies), 4 or 5 should do. They should not eat the sweets. On your signal, members are to interact with each other. The catch is to try and get others to answer “yes”, “no” or “I don’t know” to any question you may ask them. If someone answers with any of these, they have to hand over one of their sweets to you.
Soon everyone will figure out how the game is played and the cunning guys or gals will succeed.
I like to get them going by giving the signal to start, and then asking : Do you guys want me to play along? (or some other question). Without fail, most will shout “Yes!”. I then collect sweets from all of them
There will also be disputes amongst 2 players as to the handing over of sweets, but there always tend to be enough eye-witnesses to say who should actually win sweets. Or you can just catch them off-guard and ask: Did he/she get you to lose a sweet? If they answer yes or no, they lose a sweet to you.
At the end of the game (you decide when this is. usually 10 minutes is enough), those who managed to lose all their sweets are to entertain the rest by singing a silly song with actions, or something to that effect.