Marco was watching a movie while eating popcorn when Star arrived. "Marco, I heard you brought some corn." she said, before asking dreamily. "C-Can I have some?"
"No."
"B-B-B-But...I won't get to eat anything until lunch!" squealed the girl, genuinely surprised. "And I really like corn-"
"Star, I already told you that you can't have any."
"Why not?! Corn was the sole source of food my people had in the hard times!" hissed Star melodramatically. "If those times were back, you'd be denying me my only way to survive!"
Marco remained indifferent, mostly because Star was just acting like a drama queen at this point.
"I NEED CORN!" shrieked the princess.
Marco threw some popcorn at Star's face and then showed her the popcorn bowl. "You can't have corn, because I already turned it into popcorn," he told her as the girl grabbed the bowl and started to examine it.
After a couple seconds scanning the thing, Star was now in her room, making an experiment on the popcorn while writing the next down: "Mental note: Marco's some sort of magician, he turned corn into something called popcorn!"