What was that sound?

On Monday night, we were sitting outside at our home-away-from-home, Bouldin Creek Coffeehouse, and we heard a strange popping noise. For about 20 minutes. We pondered on the noise. It could have been fireworks, a cluster bomb, or the sound of thousands of people slapping mosquitos on their legs...very loudly.
So this question has bugged us and we thought we'd leave it up to you to decide what it was. Or maybe a few of you are in the know and wouldn't mind enlightening the rest of us. Please.
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