Taken from Fun and Games group in GR.

Person 1 posts a sentence, and the next person has to develop this sentence - but using Fortunately/Unfortunately at the beginning of every new sentence.
You can choose what to use - Fortunately/Unfortunately - as you wish 

Example
Person 1: I went to a bookstore today
Person 2: Fortunately, there were lots of new books in there!
Person 3: Unfortunately, all of them belonged in a genre I hate
Person 4: Unfortunately, although I was open for new reading opportunities - they were all pretty cheesy
Person 5: Fortunately, I've just finished a lengthy, high-level classic piece of literature, I needed something light and stupid to balance it
Person 6: Fortunately, I saw all of them were on sale! 60% off, wow!
Person 7: Fortunately, I quickly found a book I might love so I bought it right away
Person 8: Unfortunately, my teacher just saw me holding my brand new copy of "teenage love" and gave me this weird look. Awkward!
[...]

and so on. Fun, right?

I'll start:

fortunately nobody died

Unfortunately, it's because everybody is already dead.

Unfortunately, it is all zombie walking

Fortunately all the guy zombies are cute 

Fortunately, they can't be horny whereas female are super horny

Fortunately. they need not to be horny as they are all mated.

Fortunately, the male zombies are in proportion to female zombies 

Fortunately, the males are redundant and can;t use their equipment.

Fortunately by equipment you mean the hammers so they just improvise. 

Fortunately, drinking water can appease their hunger.

Fortunately, since they are zombies, they can drink unclean water.

Fortunately, they inhabited the Moon.

Unfortunately, they were lead by Niobe

Fortunately, Nin was her slave 

fortunately it was sex slave ')