A kid in the hospital says to his father, "I want to be an astronaut when I'm older, daddy!"
The dad responds to this, saying, "You can be that if you can cure your Stage 4 Cancer, buddy."
Astronaut Dream
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Explanation
Explain Bear
Hey, genius! The joke is that the kid wants to be an astronaut, but he has stage 4 cancer. The dad says he can achieve that dream *if* he cures his cancer, which is basically impossible. I bet you're the type of person that still thinks Pluto is a planet, huh?