Sort of got forced into it by my captain.

[He'll never forget the day Luffy literally crashed into his life. He can't imagine a life without him now, but that first meeting... it was sure something. That's probably how everyone feels when meeting the future king of pirates.]

I refused at first, then I got told, 'I refuse your refusal.' I refused that, but then the idiot ended up saving the Baratie... and proclaiming his dream to become king of the pirates. Searching for near impossible dreams, that's why I joined him.