I prefer the volcano effect myself!! Baking soda and vinegar!!!!! Love the bubbling!!!!
if you like volcano effects...here,s a nice practical joke, ...just mix your baking soda,with yer sugar....or as i did once when i was working offshore, and the cook in the galley...who ..was a Texan from Galveston....who could,nt cook to save himself..but he was good at steamed puds,..anyway, me and another guy...another Texan...crept into the galley store, and we emptied a 7lb tin of baking powder into a 20lb tin of self-raising flour....having first removed some of the flour,....a few days later the cook was making a big steamed pudding, for the rig boss and the pusher,...suffice to say....they never got their steam pud....as the mix blew the lid off the 25gal steamer, and the pud dough went everywhere....poor cookie....he never again got to make a steam pud..