One player starts with a neutral sentence, then someone else says something bad that starts with Unfortunately, or it's synonyms, and then someone else says something bad that starts with Fortunately, or it's synonyms, then another says a bad thing, then another says a good thing and you get it.
P1: Sam walked through a street.
P2: Unfortunately, he was walking through Pothole Street.
P3: Fortunately, he was careful.
P2: Sadly, he was pushed by someone and fell into a pothole.
P3: Good thing, he was helped.
P1: Badly, he was hit by a bike.
Bob was shopping in the mall.