Foam swallowed an entire beach and half the nearby buildings, including the
local lifeguards' centre, in a freak display of nature at Yamba in New South
Wales. One minute a group of teenage surfers were waiting to catch a wave,
the next they were swallowed up in a giant bubble bath. The foam was so
light that they could puff it out of their hands and watch it float away.

http://www.neatorama.com/2007/08/28/...cean-of-froth/