The Brotherhood of the Red Coast were a feared band of smugglers and shipwreckers, and if one of the sailors they'd stranded turned out to be a pirate with a price on his head, they'd dabble in bounty collection as well.

Luffy, challenge, really big maze, treasure if he wins, death if he loses. Are any more explanations required?

"Zoro!" Luffy gave him a happy grin, looked out at sea...swung his head about to give his first mate a slightly longer look centered on the latter's new bust line, then back up at Zoro's face as he waved excitedly. "Hurry up! Nami says the log pose will set here if we wait too long, and then we won't be able to sail to Merman Island because we'll be set on another course. Hey, do you know your clothes are too big?"

Sanji didn't wonder why he gave himself the challenge. It didn't matter why. ‘Why’ was probably covered by one-upping the bloody swordsman, and maybe there were other reasons - stranger reasons - but that was the only one that really counted, right? It was decided. He was going to get Zoro to appreciate - no, love Sanji's food. If Sanji couldn't do it, then he wasn't a true sea-cook after all.

Nami's nakama were certifiable. Loony-bin material, every last one of them.

The plan was simple, as good a plan as a clan of shipwreckers and bounty-hunters could ever come up with. Capture one of the weaker Straw Hats, the ones without bounties, and make them beg for mercy until the stronger ones surrendered. Nothing can possibly go wrong with such an easy, straightforward scheme. Time to make some money!