A firefighter, a Native American, and a soldier are in a plane...

...flying over the US. They aren't up very high and so the windows are open (ignore the unscientific logic of this, it's a joke). They've been in there quite some time, and the firefighter starts getting bored. He pulls out his extra hat and drops it out the window just to see what will happen.
It plummets to the ground and they can't see it land- they're too far up.

Now both the soldier and the Native American are looking at him like "what the hell, dude." So he thinks fast and says "It was in honor of my comrade who died in 9/11." The Native American then walks over and drops a spear out the window and says "It was in honor of my tribe leader who died in a terrible accident."
Then the soldier, who clearly isn't the brightest crayon in the box, feels like he has to one-up them. He has nothing on him, however, except a small explosive. He tosses it out the window and says "It was for my country."

They land nearby, and they see two kids sobbing and one laughing hysterically. The firefighter goes to one of the sad kids and asks what's wrong. The kid points to a huge bruise on his head. "A helmet fell from the sky and I think I have a concussion!"
The Native American, fearing the worst, speaks to the other crying kid. "Are you okay?"
The child shakes his head. "A spear fell from the sky and hit my cat! She's dead!"
The soldier approaches the last child, the one laughing, and says, "What's so funny?"
The boy can barely formulate a response through his giggles, but he finally manages to force out,
"Johnny farted and the house blew up."