Luffy's favourite question?

One Piece Ep. 337

 

"DO YOU POOP?"

 Mystery solved!

One Piece Ep. 386

 "CAN YOU POOP?"

 ?

Even after 2 years...

One Piece episode 529

 "DO YOU POOP?"

Mystery Unsolved!

It looks like he hasn't found the answer yet...

And now I wonder how do Brook and mermaids poop?