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The heady crazed state achieved by a group of giggling people while indulging in a frenzied round of bonking each other's noggins with empty 2-liter plastic soda-bottles. The loopy euphoric mood can be heightened even more by (1) using the jumbo-size 3-liter bottles instead of the 2-liter size, since the bigger firmer bottle produces a more solid *thunk* and bounces higher with each klonk, and/or (2) using two bottles at once --- one held in each hand --- to simultaneously pummel the heads of your two nearest neighbors in the crowd.
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