How to use the sugar packets at your table to drink for free!
The Setup: Grab a fistful of sugar packets and start writing the numbers 1-9 on them. Lay them in a pile and propose that everyone pick their winner and write it down: begin the "tournament" by shuffling the packets and tossing them in the air. Once they land, any face-down packet is eliminated, while the ones with numbers showing stay in the game. Keep playing until only one numbered packet remains... unsurprisingly, the number matches your prediction!
The Work: before starting the game, secretly make sure you've already written the number "4" on the back of the fourth packet down. When you write the numbers 1-9 on the packets, you'll have secretly created a "double-headed" sugar packet, guaranteeing you the win!