Yeah I'll agree that this arc is probably the funniest so far, mainly because of the zombies and of course Luffy is always there to add to the humor
From Chapter 217 (This was in the first post as well but I think the quote is so much better when you can see Usopp trying to explain it to Luffy.)
From Chapter 429
Not really a quote but still one of my favourite panels
From Chapter 446
From Chapter 447Usopp: Hey Nami is something wrong!?
Chopper: Eww. Usopp's fart reeks even as far as this
*Usopp sees Nami naked
Usopp: (bowing) Thank you
Chopper: Huh, you thanked her!
Luffy: I caught him!
Franky: Me too, it's a strange one
Tree: Whoa, please overlook me
Luffy: Hey you, wanna join me on a pirate's c-
Sanji and Zoro: Stop ******* around!!