joshenglish was less impressed than I, but nonetheless the experience was entertaining. My only regret was that I expected a giant baking soda dune drenched with vinegar, when in fact they managed the affair with pipes and buckets inside a covered frame.
Nonetheless, eppur si fizze.
Some photographic evidence and a video.
Note tillyjane, the Niece, joshenglish and AH among the excited crowd.
As usual, more at the Flickr set