The first person states something good, and the next person will say something bad/negative to that last post, then the next one will say something worse to that last post. Then, the whole cycles repeats itself.
Person 1: "Good: I won the lottery"
Person 2: "Bad: The prize is $1"
Person 3: "Worse: They got the wrong person"
Person 4: *another good situation*
And so on and so forth...
Please put the word "Good" or "Bad" or "Worse" before your sentence to avoid confusions. When the Worse situation has been posted, then that particular situation has ended and the next person can start another situation. I will start:
good: I won a contest