I stumbled across this BBC article about a waterfall blowing upwards due to the fierce winds afflicting the area. What impressed me more was the existence of this waterfall, which Julie and I were never aware of in all the times we've been to Australia!
I suspect it's in Royal National Park though we ourselves never had a chance to visit it, especially given the drought conditions we were faced with. However, it looks like the heavy rains both this year and last have revived many waterfalls there, including this one!
Check it out!