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Another variant on this one, that works for really dead times, often filling lulls while chain smoking at Shari's, is to proceed as follows. Take a lighter, or any object really, but we're using a lighter for this example.

Now hold the lighter, and while moving it around and doing some other things, chant, "Lighter game, lighter game, can you play, the lighter game?" and hand it off to the next person. The trick is to find the one action that you took that you will deem the winning action. The next person will then try to replicate the action, usually while doing a few other things at once, while chanting the same phrase. If they succeed, you say, "Yes, you can play the lighter game," and they hand it off to the next person. Continue along until everyone has won, or everyone gives up and stabs you.

Good ways to keep it going are to do something extravagant, complex, duplicatable, but utterly useless with your hand, and making the key action something like blinking or tapping your foot. Also fun to do with large unwieldly objects like running chainsaws!

Yes, that chainsaw comment is a joke.