Here's how it works:
I will introduce a sentence. The next nerdfighter will continue a story by writing a sentence of own, beginning with the word 'unfortunately'. Then the next post will be a further continuation, beginning with 'fortunately'.
The cycle will return to unfortunately, and it will continue on by going back and forth between the two.
A: I bought a car.
B: Unfortunately, it broke down.
C: Fortunately, somebody stopped to help me.
Today, I arrived in Africa.