Pretty easy. Each sentence should start with either "fortunately" or "unfortunately" and it always alternates.
EXAMPLE:
Person A - Fortunately, Lapis and Peridot defeated cows that raided their barn
Person B - Unfortunately, their meep-morps got destroyed in the process.
Person C - Fortunately, Sadie finally sang in Beach-a-palooza
Person D - Unfortunately, Lars decided to ditch
And so on.
Rules:
-If there is a "fortunately" text then you must respond with an "unfortunately." See second rule for more
-There may not be two "fortunately" or "unfortunately" texts in a row. However, mistakes do happen
-You may not respond to your own text.
-Keep it funny
-You do not have to create a story out of this
-KEEP IT APPROPRIATE. No NSFW or swearing.