There's a traditional variant of this schema:
A poor man uses all his money to buy a horse. "You must be happy", his neighbor says. "I don't know", answers the man.
The next day, the horse escapes. "Your hard-earned money, and your horse, both gone. You must be sad", his neighbor says. "I don't know", answers the man.
A few days later, the horse comes back, with a female horse. "Now you have two horses, and very soon a third one. You must be happy", his neighbor says. "I don't know", answers the man.
The next day, the man's son tries to care about the new horse, but the horse rebels and the son has his leg broken. "That's your only son, and know he won't be able to work or provide for you in your old days anymore. You must be sad". "I don't know", answers the man.
A few days later, this is war. All young men must leave and go to war. Since the man's son is injured, he doesn't have to go. "Your son won't have to face the horror of war. How good for both of you ! I wish my own son was still there with me".
Some versions of the story stop there, but it can keep going, and end either on a positive event or on a negative one.
Basically, this is a story about how you can never know if an event will be good or bad, no matter the first impression. It cannot fit any of those story patterns.