Pretty sure I just witnessed a great war between Australia and Great Britain in yeast form! I have a 5 gallon batch of homebrew that looked like no fermentation was happening, at all. The Aussie yeast I pitched wasn't doing jack. My local shop didn't have any more so I bought some British yeast and added it to the fermenter along with a little yeast nutrient. ALMOST INSTANTLY the beer started foaming up and rose like 5 inches. Turns out the Aussies were alive, just silent, like ninjas. Ninjas that said FU to their British invaders. Now I play the waiting game.