I was ever in such situation in Pakistan back in 2010 on an airblue flight from Karachi to Islamabad when suddenly the plane dive about 2500 feet in 1 sec and the crew on board struck their head on roof and shouted "teesra kalma parho, teesra kalma parho" The captain get control in 2 minutes approximately and everything was okay, but all the plan was smelly with vomiting and peeing specially by the female passengers. Alhamdulillah everything was okay, but the incident print some hard and unforgettable sounds in my memory. May ALLAH save us all from such situations. Ameen