Why Does Bonking Beer Bottles Create Foam? - Instant Egghead #66

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It's the classic party prank: smack your beer bottle on top of someone else's and watch as their bottle wells over with a seemingly endless river of foam. As it turns out, the prank has some interesting physics behind it. Scientific American editor Michael Moyer explains.

More to explore:

Why does a beer bottle foam up after a sudden impact on its mouth?
http://arxiv.org/abs/1310.3747

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Video credits:
Edited by Kathryn Free and Eric R. Olson
Produced by Eric R. Olson