Hand a lei, cheap bead necklace, or some party favor to each of your guests when they first arrive.
Give each of them a “magic” word they cannot say at any time during the party.
Choose words that are commonly said in regular speech to keep people paying attention.
Each person is to listen for their magic word and collect leis, necklaces, or favors from other guests who say them.
They can also trick people into saying their magic word.
The winner is the person who collects the most trophies.