"Don't riot! Be happy! Cavort with inflatable sluts!," or something to that effect, might be the unofficial motto of the Ninth Annual Bubble Baba Challenge — in which 800 brave participants ride inflatable sex dolls down the Vuoksa river rapids, about 50 miles from St. Petersburg. The entire event lasts about three minutes, and was conceived by organizer Dmitry Bulawinov "as a joke at a party where the men got drunk and the women didn't show up."