Heartwarming / Zathura

• Even from the beginning, the Astronaut showed himself to be in Danny's corner when he arrives and demands who spun him.
  Walter: (Immediately gesturing to Danny with his head) He did.
  Astronaut: Don't be so quick to sell out your brother; he's the only one you've got.
• Once Walter obtains a card that grants his wishes, the "shooting star" card. The astronaut goes into a panic and looks for Danny in the boy's room. When he can't find Danny, he starts to snap at Walter. Only for Danny to come out from under his bed and demand that the man leave Walter alone. This is heartwarming because moments before Danny hid under his bed because the two boys had just been fighting (again).
  Walter: The card worked...
  Astronaut: Yeah, it worked, congratulations! We're stuck in space now forever!
  Danny: Leave him alone.
• Just before Walter lowers Danny down in the dumbwaiter to the basement so, Danny can sneak past the Zorgons and retrieve the game.
  Walter: Nothing's gonna happen to you, okay?
  Danny: Yeah.
  Walter: Cause I'm your brother, and that's what being a brother means. I won't let anything ever happen to you.
• "I wish the astronaut had his brother back."
  • Adding on to this, just the happiness the astronaut has when he gets his brother back.
• It happens so fast that many won't catch it, but just as the Zathura black hole starts eating up the house, Lisa is the first sucked up. She's the first simply because she grabbed Walter and put herself in harm's way making certain he didn't get sucked in.
• When the meteor shower starts falling on the house, Walter shows his first sign of trying to protect Danny by yelling for his brother to join him for cover in the bricked-up fireplace. Not only that, but Danny also makes sure to grab their hamster's cage and bring it in with him; then both brothers press their hands over the top of the cage as if to try and shield their pet from harm.