My dad told me that his dreams were shattered a few years ago.
Then I asked him how many years ago.
He replied with, "When were you born?"
Shattered Dreams
Categories
Explanation
Experiment
The humor comes from the dad using the child's birth as a point of reference for when his dreams were shattered, implying the child's birth was the cause. It's a playful, slightly self-deprecating way of saying having a child changed his life.