One Piece Chapter 30, page 15: GREAT!!!

The hypnosis works instantly on Luffy, who falls fast asleep with a loud "ZZZ...". However, because he fell asleep while holding the massive ship bow, he drops it. The giant wooden cat head crashes down with a colossal "DOSHUUU!" directly onto the crowd of Black Cat Pirates, crushing them beneath its weight. Only Luffy's legs stick out from underneath, snoring peacefully.