One Piece Chapter 1.1, page 14-15: Romance Dawn (Version 1)

In the flashback, young Luffy sits in a small rowboat on the ocean, smiling confidently. He thinks, "IT DOESN'T MATTER. IF I'LL NEVER BE ABLE TO SWIM, THEN I JUST HAVE TO NEVER FALL OVERBOARD. NO MATTER WHAT, I'M GOING TO BECOME A PIRATE AND LIVE FREELY. Suddenly, a giant sea monster with sharp teeth erupts from the water and bites Luffy's boat completely in half with a loud "CRUNCH". Luffy is thrown into the air, crying out, "AH!". He splashes into the water and begins to sink, flailing his arms in terror and screaming, "UWAAAAAH SOMEONE HELP ME!!! I CAN'T SWIM".

In the water, Shanks suddenly appears and grabs young Luffy, holding him close. Luffy opens his eyes in tears, whispering, "SHANKS...". The giant sea monster looms over them, ready to strike. Shanks turns his head and glares intensely at the beast, commanding with absolute authority, "SCRAM.". The sea monster is instantly terrified, sweating and trembling before quickly swimming away into the depths. Luffy clings to Shanks, crying. Suddenly, he notices something and screams in horror, "SHANKS!!! YOUR ARM!!!!". The water around them is stained with blood.