Mr Brown Show "The Wave Song"
15 years ago

2. Meteor showers strike the Earth .

3. A viral outbreak kills all of mankind . 
4. Razing of trees causes a decrease in oxygen levels , killing thousands . 
5.The Sun dies and the resulting explosion envelops the Earth .
6. Infighting and wars slaughter all humanity . 
7. Aliens wipe out the human race . (Not too possible , but still ...) 
8. Natural disasters wreck the Earth .
As you can see , there are many ways the world could end , and these are only MY theories . What other possibilities might have been suggested by other people ?
P.S. Do you see who the writer is ?