Disclaimer: I Don't Own One Piece or the Original Song From Frozen.
Luffy was in a coma and it was Sabo's fault. He wasn't there in time to save his little brother from that Mingo guy.
The blonde sat by his little brother's beside tears in his eyes and started to sing to his brother:
"Sure, I'll build a snowman and I'll go out and play."
"Have no fear big brother's here to save the day."
"Ace will come around and then we can all play."
"So dry those tears because I'm never going away."
"Sure I'll build a snowman and play the games you want to play."
"Just get your straw-hat and we'll go right out and play."
"Wipe those tears big brother's here"
"Everything will be okay. We'll have fun and spend the day."
"Sure, I'll build a snowman..."
"Just open your eyes before the day goes away."
"Of course I'll build a snowman."