Just my guess....
The terrorist strike on New York on Sept 11 left an indellible impression in the minds of most everyone. The constant image of planes crashing into buildings was replayed over and over and burned into our brains. When a person thinks of terrorist, this is generally the first thought that comes to mind, and I think the meteorites/planes crashing/buildings falling is your mind reviewing those events. Perhaps the stimulus was some recent terrorist event (such as the assasination of Bhutto), which the mind interpeted in terms of the 9/11 attack.
Elephants? I'm not sure, maybe they are important people, big things like countries, something like that - even big important things can be struck by terrorists.
Or you could be the reincarnation of Chicken Little.
